(CNN)Across the United States, prized chickens are laying life-saving eggs at secret farms.

Few people know where the chickens are kept — their locations are undisclosed as a matter of national security.Each day, hundreds of thousands of their eggs are trucked to storage facilities, where they are protected by guards and multimillion-dollar, government-funded security systems.But these eggs aren’t for breakfast; they’re the source of your common flu shot.For the past 80 years, much of the world has relied on chicken eggs for the production of influenza vaccines. Read MoreAbout 174.5 million doses of the flu vaccine were distributed across the US this flu season through the end of February, of which an estimated 82% were egg-based, according to the Centers for Disease Control and Prevention (CDC).With each egg producing one vaccine, that means the US might have used 140 million eggs this flu season alone. To prepare for annual flu seasons, as well as possible pandemics, the US government has invested tens or hundreds of millions of dollars over the past 15 years to ensure there are enough eggs for vaccines.But now the world faces a new crisis: the novel coronavirus, which has infected more than 423,000 people globally and killed more than 19,000 since the virus emerged last December, according to Johns Hopkins University.There is no vaccine yet for the virus; and because it’s different than the influenza virus, traditional methods like using eggs won’t work. As scientists race to find a cure, the huge US stockpile of eggs won’t be of any help.The rise of the egg-based vaccineScientists started exploring the use of eggs in vaccine production in the 1930s. Researchers in England conducted the first trials on their armed forces in 1937, and the year after the US found it could protect its military with the flu shot. A working egg-based vaccine was ready for the US public by the 1940s.Trays of chicken eggs are loaded onto racks during a demonstration at a Sanofi Pasteur facility in Swiftwater, Pennsylvania in July 2007. Trays of chicken eggs are loaded onto racks during a demonstration at a Sanofi Pasteur facility in Swiftwater, Pennsylvania in July 2007. Trays of chicken eggs are loaded onto racks during a demonstration at a Sanofi Pasteur facility in Swiftwater, Pennsylvania in July 2007. Here’s how it works today: The US CDC and other labs partner with the World Health Organization (WHO) to choose certain virus strains to send to private vaccine manufacturers. The flu can mutate and strains can change each year, meaning new vaccines are needed for every flu season.The selected virus is injected into a fertilized hen’s eggs, where it incubates and replicates for a few days — just as it would do inside a human host.A laboratory technician injects influenza virus into hens' eggs during vaccine research at the Torlak Institute of Virology in Belgrade, Serbia, on March 3.A laboratory technician injects influenza virus into hens' eggs during vaccine research at the Torlak Institute of Virology in Belgrade, Serbia, on March 3.A laboratory technician injects influenza virus into hens’ eggs during vaccine research at the Torlak Institute of Virology in Belgrade, Serbia, on March 3.Scientists then harvest fluid containing the virus from the egg. They inactivate the virus so it can no longer cause disease, and purify it, leaving scientists with the virus antigen. The antigen is the crucial element — it’s a substance released by the virus that triggers your immune system to respond. That’s how the vaccine prepares your immune system for a real infection.The entire process, from the arrival of the egg to the publicly available vaccine, takes at least six months, according to the CDC. The government gets its vaccines from a handful of manufacturing companies, which source their eggs from numerous farms in secret locations. The farms’ locations are “proprietary information,” said a spokesperson from Sanofi Pasteur, the biggest flu vaccine manufacturer in the US, citing “security sensitivities.”The eggs don’t come cheap: the Department of Health and Human Services (HHS) spent $42 million on a three-year contract with one company to ensure a year-round supply of high-quality eggs, according to a 2017 report from the US Government Accountability Office (GOA). That’s just one company from one time period; the HHS began contracting a handful of manufacturers and egg farms in 2005, meaning there are likely many more contracts worth tens of millions of dollars.And these eggs are precious: if the supply chain is compromised, it could mean a nationwide shortage of crucial flu vaccines.So, obviously, the eggs have bodyguards. Part of that $42 million contract required that the vaccine manufacturer had “both a physical security program and a biosecurity program to provide protection against man-made and natural threats,” according to the GOA report.That might seem like a lot of money to spend on eggs, but each year the flu costs the US about $10.4 billion in hospitalizations and treatments, according to the CDC.And the eggs aren’t only useful for flu vaccines — they could potentially be used to develop vaccines for other illnesses, said Leo Poon, head of public health laboratory sciences at Hong Kong University (HKU). It just depends on the illness, as some virus strains can’t incubate inside eggs.Why the egg method won’t work for a coronavirus vaccineAs the coronavirus pandemic spreads, scientists and governments around the world are racing to develop a vaccine — but eggs won’t be the answer, said John Nicholls, a Hong Kong University clinical professor of pathology.Due to having different receptors and other characteristics, the novel coronavirus isn’t able to replicate inside eggs the way flu viruses can, Nicholls said.Even beyond the immediate problem of the coronavirus, US officials have been pushing for non-egg alternatives in recent years.US President Donald Trump signed an executive order last September requiring health agencies to expand the use of alternative production methods.One reason officials are looking elsewhere is the six-month production time can be too slow. Not only could an illness spread globally during that time, but the virus injected into the egg could mutate and make the vaccine less effective, said Poon.Vials of a H1N1 flu vaccine manufactured by Sanofi Pasteur in October 2009.Vials of a H1N1 flu vaccine manufactured by Sanofi Pasteur in October 2009.Vials of a H1N1 flu vaccine manufactured by Sanofi Pasteur in October 2009.Another issue is that the supply is vulnerable to deadly avian flus. “If there’s a pandemic of H5N1 (avian influenza), it can kill chickens substantially and there will be a huge drop in egg supply, and you will have a problem getting enough eggs to make the vaccines,” Poon said.The GOA report warned that it takes about 12 to 18 months to establish an egg supply large enough for either seasonal or pandemic influenza. But in the case of a fast-spreading pandemic like this, authorities simply can’t wait that long — and there aren’t that many chickens and eggs immediately available.More than 20 potential coronavirus vaccines using a range of non-egg technologies are now in development, according to the WHO. Some of these are mRNA vaccines, which direct cells in the body to make proteins to prevent or fight disease using messenger ribonucleic acid, a molecule vital to the proper functioning of the body’s cells. Others use recombinant DNA technology, which produces an exact genetic match to proteins of the virus, and can then rapidly produce large amounts of antigen.Coffins carrying coronavirus victims are stored in a warehouse in Ponte San Pietro, Italy, on Thursday, March 26. They would be transported to another area for cremation.Coffins carrying coronavirus victims are stored in a warehouse in Ponte San Pietro, Italy, on Thursday, March 26. They would be transported to another area for cremation. Photos: The novel coronavirus outbreak Coffins carrying coronavirus victims are stored in a warehouse in Ponte San Pietro, Italy, on Thursday, March 26. They would be transported to another area for cremation.Hide Caption 1 of 164People wearing face masks walk near the USNS Mercy on Friday, March 27, after the Navy hospital ship arrived in San Pedro, California, <a href="https://www.cnn.com/2020/03/27/us/california-hospital-ship-trnd/index.html" target="_blank">to assist local hospitals</a> dealing with the coronavirus pandemic. Another hospital ship is going to New York.People wearing face masks walk near the USNS Mercy on Friday, March 27, after the Navy hospital ship arrived in San Pedro, California, <a href="https://www.cnn.com/2020/03/27/us/california-hospital-ship-trnd/index.html" target="_blank">to assist local hospitals</a> dealing with the coronavirus pandemic. Another hospital ship is going to New York. Photos: The novel coronavirus outbreak People wearing face masks walk near the USNS Mercy on Friday, March 27, after the Navy hospital ship arrived in San Pedro, California, to assist local hospitals dealing with the coronavirus pandemic. Another hospital ship is going to New York.Hide Caption 2 of 164Pope Francis prays in an empty St. Peter's Square on March 27.Pope Francis prays in an empty St. Peter's Square on March 27. Photos: The novel coronavirus outbreak Pope Francis prays in an empty St. Peter’s Square on March 27.Hide Caption 3 of 164A screen advises motorists to stay home in Manchester, England.A screen advises motorists to stay home in Manchester, England. Photos: The novel coronavirus outbreak A screen advises motorists to stay home in Manchester, England.Hide Caption 4 of 164Members of Iran's Revolutionary Guard prepare to take part in disinfecting the city of Tehran on Wednesday, March 25. Members of Iran's Revolutionary Guard prepare to take part in disinfecting the city of Tehran on Wednesday, March 25. Photos: The novel coronavirus outbreak Members of Iran’s Revolutionary Guard prepare to take part in disinfecting the city of Tehran on Wednesday, March 25. Hide Caption 5 of 164Lydia Hassebroek attends a ballet class from her home in New York on March 25.Lydia Hassebroek attends a ballet class from her home in New York on March 25. Photos: The novel coronavirus outbreak Lydia Hassebroek attends a ballet class from her home in New York on March 25.Hide Caption 6 of 164People visit the Beijing Zoo on March 25 after it reopened its outdoor exhibits to the public.People visit the Beijing Zoo on March 25 after it reopened its outdoor exhibits to the public. Photos: The novel coronavirus outbreak People visit the Beijing Zoo on March 25 after it reopened its outdoor exhibits to the public.Hide Caption 7 of 164The Olympic flame is displayed in Iwaki, Japan, on March 25, a day after the 2020 Tokyo Games <a href="https://edition.cnn.com/2020/03/24/sport/olympics-postponement-tokyo-2020-spt-intl/index.html" target="_blank">were postponed.</a>The Olympic flame is displayed in Iwaki, Japan, on March 25, a day after the 2020 Tokyo Games <a href="https://edition.cnn.com/2020/03/24/sport/olympics-postponement-tokyo-2020-spt-intl/index.html" target="_blank">were postponed.</a> Photos: The novel coronavirus outbreak The Olympic flame is displayed in Iwaki, Japan, on March 25, a day after the 2020 Tokyo Games were postponed.Hide Caption 8 of 164People practice social distancing as they wait for takeout food at a shopping mall in Bangkok, Thailand, on Tuesday, March 24.People practice social distancing as they wait for takeout food at a shopping mall in Bangkok, Thailand, on Tuesday, March 24. Photos: The novel coronavirus outbreak People practice social distancing as they wait for takeout food at a shopping mall in Bangkok, Thailand, on Tuesday, March 24.Hide Caption 9 of 164Authorities are seen in Madrid, where an <a href="https://edition.cnn.com/2020/03/24/europe/spain-ice-rink-morgue-coronavirus-intl/index.html" target="_blank">ice rink has been converted into a makeshift morgue</a> to cope with the coronavirus fallout.Authorities are seen in Madrid, where an <a href="https://edition.cnn.com/2020/03/24/europe/spain-ice-rink-morgue-coronavirus-intl/index.html" target="_blank">ice rink has been converted into a makeshift morgue</a> to cope with the coronavirus fallout. Photos: The novel coronavirus outbreak Authorities are seen in Madrid, where an ice rink has been converted into a makeshift morgue to cope with the coronavirus fallout.Hide Caption 10 of 164A tourist wears a face mask while visiting the Badaling section of the Great Wall of China on March 24. The section <a href="https://www.cnn.com/travel/article/badaling-great-wall-china-reopens-intl-hnk/index.html" target="_blank">reopened</a> to visitors after being closed for two months.A tourist wears a face mask while visiting the Badaling section of the Great Wall of China on March 24. The section <a href="https://www.cnn.com/travel/article/badaling-great-wall-china-reopens-intl-hnk/index.html" target="_blank">reopened</a> to visitors after being closed for two months. Photos: The novel coronavirus outbreak A tourist wears a face mask while visiting the Badaling section of the Great Wall of China on March 24. The section reopened to visitors after being closed for two months.Hide Caption 11 of 164People arrive at the South Municipal Cemetery in Madrid to attend the burial of a man who died from the coronavirus.People arrive at the South Municipal Cemetery in Madrid to attend the burial of a man who died from the coronavirus. Photos: The novel coronavirus outbreak People arrive at the South Municipal Cemetery in Madrid to attend the burial of a man who died from the coronavirus.Hide Caption 12 of 164A normally busy street is mostly empty in Pattaya, Thailand, on Monday, March 23.A normally busy street is mostly empty in Pattaya, Thailand, on Monday, March 23. Photos: The novel coronavirus outbreak A normally busy street is mostly empty in Pattaya, Thailand, on Monday, March 23.Hide Caption 13 of 164Passengers arrive at Hong Kong International Airport on March 23. Passengers arrive at Hong Kong International Airport on March 23. Photos: The novel coronavirus outbreak Passengers arrive at Hong Kong International Airport on March 23. Hide Caption 14 of 164Giuseppe Corbari holds Sunday Mass in front of photographs sent in by his congregation members in Giussano, Italy, on March 22. Many religious services are being streamed online so that people can worship while still maintaining their distance from others.Giuseppe Corbari holds Sunday Mass in front of photographs sent in by his congregation members in Giussano, Italy, on March 22. Many religious services are being streamed online so that people can worship while still maintaining their distance from others. Photos: The novel coronavirus outbreak Giuseppe Corbari holds Sunday Mass in front of photographs sent in by his congregation members in Giussano, Italy, on March 22. Many religious services are being streamed online so that people can worship while still maintaining their distance from others.Hide Caption 15 of 164People clap from balconies to show their appreciation for health care workers in Mumbai, India.People clap from balconies to show their appreciation for health care workers in Mumbai, India. Photos: The novel coronavirus outbreak People clap from balconies to show their appreciation for health care workers in Mumbai, India.Hide Caption 16 of 164A woman attends a Sunday service at the Nairobi Baptist Church in Nairobi, Kenya, on March 22. The service was streamed live on the internet.A woman attends a Sunday service at the Nairobi Baptist Church in Nairobi, Kenya, on March 22. The service was streamed live on the internet. Photos: The novel coronavirus outbreak A woman attends a Sunday service at the Nairobi Baptist Church in Nairobi, Kenya, on March 22. The service was streamed live on the internet.Hide Caption 17 of 164A Syrian Red Crescent member sprays disinfectant along an alley of the historic Hamidiyah market in Damascus, Syria.A Syrian Red Crescent member sprays disinfectant along an alley of the historic Hamidiyah market in Damascus, Syria. Photos: The novel coronavirus outbreak A Syrian Red Crescent member sprays disinfectant along an alley of the historic Hamidiyah market in Damascus, Syria.Hide Caption 18 of 164People are seen on California's Huntington Beach on March 21. Crowds descended on California beaches, hiking trails and parks over the weekend <a href="https://www.cnn.com/2020/03/23/us/california-stay-at-home-beach-goers/index.html" target="_blank">in open defiance of a state order</a> to shelter in place and avoid close contact with others.People are seen on California's Huntington Beach on March 21. Crowds descended on California beaches, hiking trails and parks over the weekend <a href="https://www.cnn.com/2020/03/23/us/california-stay-at-home-beach-goers/index.html" target="_blank">in open defiance of a state order</a> to shelter in place and avoid close contact with others. Photos: The novel coronavirus outbreak People are seen on California’s Huntington Beach on March 21. Crowds descended on California beaches, hiking trails and parks over the weekend in open defiance of a state order to shelter in place and avoid close contact with others.Hide Caption 19 of 164A funeral service is held without family members in Bergamo, Italy, on March 21.A funeral service is held without family members in Bergamo, Italy, on March 21. Photos: The novel coronavirus outbreak A funeral service is held without family members in Bergamo, Italy, on March 21.Hide Caption 20 of 164A member of the Syrian Violet relief group disinfects tents at a camp for displaced people in Kafr Jalis, Syria, on March 21.A member of the Syrian Violet relief group disinfects tents at a camp for displaced people in Kafr Jalis, Syria, on March 21. Photos: The novel coronavirus outbreak A member of the Syrian Violet relief group disinfects tents at a camp for displaced people in Kafr Jalis, Syria, on March 21.Hide Caption 21 of 164A doctor examines Juan Vasquez inside a testing tent at St. Barnabas Hospital in New York on March 20.A doctor examines Juan Vasquez inside a testing tent at St. Barnabas Hospital in New York on March 20. Photos: The novel coronavirus outbreak A doctor examines Juan Vasquez inside a testing tent at St. Barnabas Hospital in New York on March 20.Hide Caption 22 of 164A Mass in Rio de Janeiro honors coronavirus victims around the world on March 18. Brazil's Christ the Redeemer statue <a href="https://www.cnn.com/travel/article/coronavirus-rio-christ-the-redeemer-trnd/index.html" target="_blank">was lit up with flags and messages of hope</a> in solidarity with countries affected by the pandemic.A Mass in Rio de Janeiro honors coronavirus victims around the world on March 18. Brazil's Christ the Redeemer statue <a href="https://www.cnn.com/travel/article/coronavirus-rio-christ-the-redeemer-trnd/index.html" target="_blank">was lit up with flags and messages of hope</a> in solidarity with countries affected by the pandemic. Photos: The novel coronavirus outbreak A Mass in Rio de Janeiro honors coronavirus victims around the world on March 18. Brazil’s Christ the Redeemer statue was lit up with flags and messages of hope in solidarity with countries affected by the pandemic.Hide Caption 23 of 164Medical staff wearing protective suits ride down an escalator at Moscow's Sheremetyevo International Airport on March 18.Medical staff wearing protective suits ride down an escalator at Moscow's Sheremetyevo International Airport on March 18. Photos: The novel coronavirus outbreak Medical staff wearing protective suits ride down an escalator at Moscow’s Sheremetyevo International Airport on March 18.Hide Caption 24 of 164Hasidic Jewish men take part in a <a href="https://jewishinsider.com/2020/03/white-houses-avi-berkowitz-implores-hasidic-leaders-to-follow-coronavirus-measures/" target="_blank">"social distancing" minyan</a> in New York on March 17.Hasidic Jewish men take part in a <a href="https://jewishinsider.com/2020/03/white-houses-avi-berkowitz-implores-hasidic-leaders-to-follow-coronavirus-measures/" target="_blank">"social distancing" minyan</a> in New York on March 17. Photos: The novel coronavirus outbreak Hasidic Jewish men take part in a “social distancing” minyan in New York on March 17.Hide Caption 25 of 164A patient in a biocontainment unit is carried on a stretcher in Rome on March 17.A patient in a biocontainment unit is carried on a stretcher in Rome on March 17. Photos: The novel coronavirus outbreak A patient in a biocontainment unit is carried on a stretcher in Rome on March 17.Hide Caption 26 of 164A pedestrian walks a dog through a quiet street in New York on March 17.A pedestrian walks a dog through a quiet street in New York on March 17. Photos: The novel coronavirus outbreak A pedestrian walks a dog through a quiet street in New York on March 17.Hide Caption 27 of 164People gather to collect free face masks in New Delhi on March 17.People gather to collect free face masks in New Delhi on March 17. Photos: The novel coronavirus outbreak People gather to collect free face masks in New Delhi on March 17.Hide Caption 28 of 164Dermot Hickey, left, and Phillip Vega ask a pedestrian in New York to take their picture on a thinly trafficked Fifth Avenue on March 17. Many streets across the world are much more bare as people distance themselves from others. In the United States, the White House advised people <a href="https://www.cnn.com/2020/03/16/politics/white-house-guidelines-coronavirus/index.html" target="_blank">not to gather in groups of more than 10.</a>Dermot Hickey, left, and Phillip Vega ask a pedestrian in New York to take their picture on a thinly trafficked Fifth Avenue on March 17. Many streets across the world are much more bare as people distance themselves from others. In the United States, the White House advised people <a href="https://www.cnn.com/2020/03/16/politics/white-house-guidelines-coronavirus/index.html" target="_blank">not to gather in groups of more than 10.</a> Photos: The novel coronavirus outbreak Dermot Hickey, left, and Phillip Vega ask a pedestrian in New York to take their picture on a thinly trafficked Fifth Avenue on March 17. Many streets across the world are much more bare as people distance themselves from others. In the United States, the White House advised people not to gather in groups of more than 10.Hide Caption 29 of 164Students at the Attarkiah Islamic School wear face masks during a ceremony in Thailand's southern province of Narathiwat on March 17.Students at the Attarkiah Islamic School wear face masks during a ceremony in Thailand's southern province of Narathiwat on March 17. Photos: The novel coronavirus outbreak Students at the Attarkiah Islamic School wear face masks during a ceremony in Thailand’s southern province of Narathiwat on March 17.Hide Caption 30 of 164People wait outside a Woolworths store in Sunbury, Australia on March 17. Australian supermarket chains announced special shopping hours for the elderly and people with disabilities so that they can shop in less crowded aisles.People wait outside a Woolworths store in Sunbury, Australia on March 17. Australian supermarket chains announced special shopping hours for the elderly and people with disabilities so that they can shop in less crowded aisles. Photos: The novel coronavirus outbreak People wait outside a Woolworths store in Sunbury, Australia on March 17. Australian supermarket chains announced special shopping hours for the elderly and people with disabilities so that they can shop in less crowded aisles.Hide Caption 31 of 164A member of Spain's Military Emergencies Unit carries out a general disinfection at the Malaga airport on March 16.A member of Spain's Military Emergencies Unit carries out a general disinfection at the Malaga airport on March 16. Photos: The novel coronavirus outbreak A member of Spain’s Military Emergencies Unit carries out a general disinfection at the Malaga airport on March 16.Hide Caption 32 of 164Displaced families near Atme, Syria, attend a workshop aimed at spreading awareness about the coronavirus.Displaced families near Atme, Syria, attend a workshop aimed at spreading awareness about the coronavirus. Photos: The novel coronavirus outbreak Displaced families near Atme, Syria, attend a workshop aimed at spreading awareness about the coronavirus.Hide Caption 33 of 164French President Emmanuel Macron is seen on a screen in Paris as he announces new coronavirus containment measures on March 16. <a href="https://www.cnn.com/world/live-news/coronavirus-outbreak-03-17-20-intl-hnk/h_da63d65d14fcffbc7105f1a287478a55" target="_blank">France has been put on lockdown,</a> and all nonessential outings are outlawed and can draw a fine of up to €135 ($148). Macron also promised to support French businesses by guaranteeing €300 billion worth of loans and suspending rent and utility bills owed by small companies.French President Emmanuel Macron is seen on a screen in Paris as he announces new coronavirus containment measures on March 16. <a href="https://www.cnn.com/world/live-news/coronavirus-outbreak-03-17-20-intl-hnk/h_da63d65d14fcffbc7105f1a287478a55" target="_blank">France has been put on lockdown,</a> and all nonessential outings are outlawed and can draw a fine of up to €135 ($148). Macron also promised to support French businesses by guaranteeing €300 billion worth of loans and suspending rent and utility bills owed by small companies. Photos: The novel coronavirus outbreak French President Emmanuel Macron is seen on a screen in Paris as he announces new coronavirus containment measures on March 16. France has been put on lockdown, and all nonessential outings are outlawed and can draw a fine of up to €135 ($148). Macron also promised to support French businesses by guaranteeing €300 billion worth of loans and suspending rent and utility bills owed by small companies.Hide Caption 34 of 164A police officer checks the temperatures of bus passengers at a checkpoint in Manila, Philippines, on March 16.A police officer checks the temperatures of bus passengers at a checkpoint in Manila, Philippines, on March 16. Photos: The novel coronavirus outbreak A police officer checks the temperatures of bus passengers at a checkpoint in Manila, Philippines, on March 16.Hide Caption 35 of 164Flowers are stored prior to their destruction at a flower auction in Aalsmeer, Netherlands, on March 16. Lower demand due to the coronavirus outbreak is threatening the Dutch horticultural sector, forcing the destruction of products.Flowers are stored prior to their destruction at a flower auction in Aalsmeer, Netherlands, on March 16. Lower demand due to the coronavirus outbreak is threatening the Dutch horticultural sector, forcing the destruction of products. Photos: The novel coronavirus outbreak Flowers are stored prior to their destruction at a flower auction in Aalsmeer, Netherlands, on March 16. Lower demand due to the coronavirus outbreak is threatening the Dutch horticultural sector, forcing the destruction of products.Hide Caption 36 of 164Body temperatures are scanned as people enter the Buddhist temple Wat Pho in Bangkok, Thailand, on March 13.Body temperatures are scanned as people enter the Buddhist temple Wat Pho in Bangkok, Thailand, on March 13. Photos: The novel coronavirus outbreak Body temperatures are scanned as people enter the Buddhist temple Wat Pho in Bangkok, Thailand, on March 13.Hide Caption 37 of 164Two nuns greet neighbors from their balcony in Turin, Italy, on Sunday, March 15.Two nuns greet neighbors from their balcony in Turin, Italy, on Sunday, March 15. Photos: The novel coronavirus outbreak Two nuns greet neighbors from their balcony in Turin, Italy, on Sunday, March 15.Hide Caption 38 of 164Pope Francis, inside the Church of San Marcello in Rome's city center,<a href="https://edition.cnn.com/2020/03/16/europe/pope-francis-prayer-coronavirus-plague-crucifix-intl/index.html" target="_blank"> prays at a famous crucifix</a> that believers claim helped to save Romans from the plague in 1522.Pope Francis, inside the Church of San Marcello in Rome's city center,<a href="https://edition.cnn.com/2020/03/16/europe/pope-francis-prayer-coronavirus-plague-crucifix-intl/index.html" target="_blank"> prays at a famous crucifix</a> that believers claim helped to save Romans from the plague in 1522. Photos: The novel coronavirus outbreak Pope Francis, inside the Church of San Marcello in Rome’s city center, prays at a famous crucifix that believers claim helped to save Romans from the plague in 1522.Hide Caption 39 of 164Passengers wait for their flights at Marrakesh Airport in Morocco on March 15.Passengers wait for their flights at Marrakesh Airport in Morocco on March 15. Photos: The novel coronavirus outbreak Passengers wait for their flights at Marrakesh Airport in Morocco on March 15.Hide Caption 40 of 164US Vice President Mike Pence takes a question during a White House briefing about the coronavirus on March 15.US Vice President Mike Pence takes a question during a White House briefing about the coronavirus on March 15. Photos: The novel coronavirus outbreak US Vice President Mike Pence takes a question during a White House briefing about the coronavirus on March 15.Hide Caption 41 of 164A Sea World employee sprays disinfectant in Jakarta, Indonesia, on Saturday, March 14.A Sea World employee sprays disinfectant in Jakarta, Indonesia, on Saturday, March 14. Photos: The novel coronavirus outbreak A Sea World employee sprays disinfectant in Jakarta, Indonesia, on Saturday, March 14.Hide Caption 42 of 164People wait in line to go through customs at Dallas/Fort Worth International Airport on March 14. Travelers returning from Europe say they were <a href="https://www.cnn.com/travel/article/coronavirus-airport-screening-sunday/index.html" target="_blank">being made to wait for hours </a>at US airports, often in close quarters, as personnel screened them for the coronavirus.People wait in line to go through customs at Dallas/Fort Worth International Airport on March 14. Travelers returning from Europe say they were <a href="https://www.cnn.com/travel/article/coronavirus-airport-screening-sunday/index.html" target="_blank">being made to wait for hours </a>at US airports, often in close quarters, as personnel screened them for the coronavirus. Photos: The novel coronavirus outbreak People wait in line to go through customs at Dallas/Fort Worth International Airport on March 14. Travelers returning from Europe say they were being made to wait for hours at US airports, often in close quarters, as personnel screened them for the coronavirus.Hide Caption 43 of 164Hundreds of people lined up to enter a Costco in Novato, California, on March 14. Many people have been stocking up on food, toilet paper and other items. As a response to <a href="https://www.cnn.com/2020/03/09/health/toilet-paper-shortages-novel-coronavirus-trnd/index.html" target="_blank">panic buying,</a> retailers in the United States and Canada have started limiting the number of toilet paper that customers can buy in one trip.Hundreds of people lined up to enter a Costco in Novato, California, on March 14. Many people have been stocking up on food, toilet paper and other items. As a response to <a href="https://www.cnn.com/2020/03/09/health/toilet-paper-shortages-novel-coronavirus-trnd/index.html" target="_blank">panic buying,</a> retailers in the United States and Canada have started limiting the number of toilet paper that customers can buy in one trip. Photos: The novel coronavirus outbreak Hundreds of people lined up to enter a Costco in Novato, California, on March 14. Many people have been stocking up on food, toilet paper and other items. As a response to panic buying, retailers in the United States and Canada have started limiting the number of toilet paper that customers can buy in one trip.Hide Caption 44 of 164A member of the White House physician's office takes a media member's temperature in the White House briefing room on March 14. It was ahead of a news conference with President Donald Trump and Vice President Mike Pence.A member of the White House physician's office takes a media member's temperature in the White House briefing room on March 14. It was ahead of a news conference with President Donald Trump and Vice President Mike Pence. Photos: The novel coronavirus outbreak A member of the White House physician’s office takes a media member’s temperature in the White House briefing room on March 14. It was ahead of a news conference with President Donald Trump and Vice President Mike Pence.Hide Caption 45 of 164A nurse in Cremona, Italy, takes a moment in this heartbreaking photo <a href="https://www.instagram.com/p/B9yaP7jIdO-/" target="_blank">posted to Instagram</a> by photographer Paolo Miranda. Italy's health care system <a href="https://www.cnn.com/2020/03/18/europe/italy-coronavirus-lockdown-intl/index.html" target="_blank">has been severely tested</a> by the coronavirus pandemic.A nurse in Cremona, Italy, takes a moment in this heartbreaking photo <a href="https://www.instagram.com/p/B9yaP7jIdO-/" target="_blank">posted to Instagram</a> by photographer Paolo Miranda. Italy's health care system <a href="https://www.cnn.com/2020/03/18/europe/italy-coronavirus-lockdown-intl/index.html" target="_blank">has been severely tested</a> by the coronavirus pandemic. Photos: The novel coronavirus outbreak A nurse in Cremona, Italy, takes a moment in this heartbreaking photo posted to Instagram by photographer Paolo Miranda. Italy’s health care system has been severely tested by the coronavirus pandemic.Hide Caption 46 of 164Reporters in Arlington, Virginia, sit approximately 4 feet apart during a briefing by Marine Corps Gen. Kenneth F. McKenzie on March 13.Reporters in Arlington, Virginia, sit approximately 4 feet apart during a briefing by Marine Corps Gen. Kenneth F. McKenzie on March 13. Photos: The novel coronavirus outbreak Reporters in Arlington, Virginia, sit approximately 4 feet apart during a briefing by Marine Corps Gen. Kenneth F. McKenzie on March 13.Hide Caption 47 of 164People walk past a closed Broadway theater on March 13 after New York canceled all gatherings over 500 people.People walk past a closed Broadway theater on March 13 after New York canceled all gatherings over 500 people. Photos: The novel coronavirus outbreak People walk past a closed Broadway theater on March 13 after New York canceled all gatherings over 500 people.Hide Caption 48 of 164A Costco customer stands by two shopping carts in Richmond, California, on March 13.A Costco customer stands by two shopping carts in Richmond, California, on March 13. Photos: The novel coronavirus outbreak A Costco customer stands by two shopping carts in Richmond, California, on March 13.Hide Caption 49 of 164A teacher works in an empty classroom at the Pompeu Fabra University in Barcelona, Spain.A teacher works in an empty classroom at the Pompeu Fabra University in Barcelona, Spain. Photos: The novel coronavirus outbreak A teacher works in an empty classroom at the Pompeu Fabra University in Barcelona, Spain.Hide Caption 50 of 164A woman looks at an empty bread aisle in Antwerp, Belgium, on March 13.A woman looks at an empty bread aisle in Antwerp, Belgium, on March 13. Photos: The novel coronavirus outbreak A woman looks at an empty bread aisle in Antwerp, Belgium, on March 13.Hide Caption 51 of 164Employees of the Greek Parliament wear plastic gloves ahead of the swearing-in ceremony for Greek President Katerina Sakellaropoulou.Employees of the Greek Parliament wear plastic gloves ahead of the swearing-in ceremony for Greek President Katerina Sakellaropoulou. Photos: The novel coronavirus outbreak Employees of the Greek Parliament wear plastic gloves ahead of the swearing-in ceremony for Greek President Katerina Sakellaropoulou.Hide Caption 52 of 164A motorcyclist drives through disinfectant sprayed in Jammu, India, on March 13.A motorcyclist drives through disinfectant sprayed in Jammu, India, on March 13. Photos: The novel coronavirus outbreak A motorcyclist drives through disinfectant sprayed in Jammu, India, on March 13.Hide Caption 53 of 164Workers prepare to construct an additional building on a hospital on the outskirts of Moscow.Workers prepare to construct an additional building on a hospital on the outskirts of Moscow. Photos: The novel coronavirus outbreak Workers prepare to construct an additional building on a hospital on the outskirts of Moscow.Hide Caption 54 of 164Paul Boyer, head equipment manager of the NHL's Detroit Red Wings, wheels out equipment bags in Washington on March 12. The NHL is among the sports leagues that have suspended their seasons.Paul Boyer, head equipment manager of the NHL's Detroit Red Wings, wheels out equipment bags in Washington on March 12. The NHL is among the sports leagues that have suspended their seasons. Photos: The novel coronavirus outbreak Paul Boyer, head equipment manager of the NHL’s Detroit Red Wings, wheels out equipment bags in Washington on March 12. The NHL is among the sports leagues that have suspended their seasons.Hide Caption 55 of 164Students leave Glacier Peak High School in Snohomish, Washington, on March 12. Beginning the following day, schools in the Snohomish school district planned to be closed through April 24.Students leave Glacier Peak High School in Snohomish, Washington, on March 12. Beginning the following day, schools in the Snohomish school district planned to be closed through April 24. Photos: The novel coronavirus outbreak Students leave Glacier Peak High School in Snohomish, Washington, on March 12. Beginning the following day, schools in the Snohomish school district planned to be closed through April 24.Hide Caption 56 of 164An Uber Eats delivery biker stands at a deserted Piazza di Spagna in Rome.An Uber Eats delivery biker stands at a deserted Piazza di Spagna in Rome. Photos: The novel coronavirus outbreak An Uber Eats delivery biker stands at a deserted Piazza di Spagna in Rome.Hide Caption 57 of 164People at a railway station in Seoul, South Korea, watch a live broadcast of US President Donald Trump on March 12. Trump announced that, in an effort to slow the spread of the coronavirus, he would <a href="https://www.cnn.com/2020/03/11/politics/donald-trump-coronavirus-statement/index.html" target="_blank">sharply restrict travel</a> from more than two dozen European countries.People at a railway station in Seoul, South Korea, watch a live broadcast of US President Donald Trump on March 12. Trump announced that, in an effort to slow the spread of the coronavirus, he would <a href="https://www.cnn.com/2020/03/11/politics/donald-trump-coronavirus-statement/index.html" target="_blank">sharply restrict travel</a> from more than two dozen European countries. Photos: The novel coronavirus outbreak People at a railway station in Seoul, South Korea, watch a live broadcast of US President Donald Trump on March 12. Trump announced that, in an effort to slow the spread of the coronavirus, he would sharply restrict travel from more than two dozen European countries.Hide Caption 58 of 164Workers in protective suits disinfect Istanbul's Dolmabahce Palace on March 11.Workers in protective suits disinfect Istanbul's Dolmabahce Palace on March 11. Photos: The novel coronavirus outbreak Workers in protective suits disinfect Istanbul’s Dolmabahce Palace on March 11.Hide Caption 59 of 164A person wearing a face mask walks outside of a shopping mall in Beijing on March 11.A person wearing a face mask walks outside of a shopping mall in Beijing on March 11. Photos: The novel coronavirus outbreak A person wearing a face mask walks outside of a shopping mall in Beijing on March 11.Hide Caption 60 of 164Police officers restrain the relative of an inmate outside the Sant'Anna jail in Modena, Italy, on March 9. <a href="https://www.cnn.com/asia/live-news/coronavirus-outbreak-03-09-20-intl-hnk/h_950c62671e245816c223fb84f1306fe6" target="_blank">Riots broke out</a> in several Italian jails after visits were suspended to curb the spread of the coronavirus.Police officers restrain the relative of an inmate outside the Sant'Anna jail in Modena, Italy, on March 9. <a href="https://www.cnn.com/asia/live-news/coronavirus-outbreak-03-09-20-intl-hnk/h_950c62671e245816c223fb84f1306fe6" target="_blank">Riots broke out</a> in several Italian jails after visits were suspended to curb the spread of the coronavirus. Photos: The novel coronavirus outbreak Police officers restrain the relative of an inmate outside the Sant’Anna jail in Modena, Italy, on March 9. Riots broke out in several Italian jails after visits were suspended to curb the spread of the coronavirus.Hide Caption 61 of 164Medical staff in Wuhan, China, celebrate after all coronavirus patients were discharged from a temporary hospital on March 9.Medical staff in Wuhan, China, celebrate after all coronavirus patients were discharged from a temporary hospital on March 9. Photos: The novel coronavirus outbreak Medical staff in Wuhan, China, celebrate after all coronavirus patients were discharged from a temporary hospital on March 9.Hide Caption 62 of 164Traders work on the floor of the New York Stock Exchange on March 9. <a href="https://www.cnn.com/2020/03/08/investing/stock-dow-futures-coronavirus/index.html" target="_blank">Stocks plummeted</a> as coronavirus worries and an oil price race to the bottom weighed on global financial markets.Traders work on the floor of the New York Stock Exchange on March 9. <a href="https://www.cnn.com/2020/03/08/investing/stock-dow-futures-coronavirus/index.html" target="_blank">Stocks plummeted</a> as coronavirus worries and an oil price race to the bottom weighed on global financial markets. Photos: The novel coronavirus outbreak Traders work on the floor of the New York Stock Exchange on March 9. Stocks plummeted as coronavirus worries and an oil price race to the bottom weighed on global financial markets.Hide Caption 63 of 164Rescuers search for victims at the site of a <a href="https://www.cnn.com/2020/03/07/china/china-coronavirus-hotel-collapse/index.html" target="_blank">collapsed hotel</a> in Quanzhou, China, on March 8. The hotel was being used as a coronavirus quarantine center.Rescuers search for victims at the site of a <a href="https://www.cnn.com/2020/03/07/china/china-coronavirus-hotel-collapse/index.html" target="_blank">collapsed hotel</a> in Quanzhou, China, on March 8. The hotel was being used as a coronavirus quarantine center. Photos: The novel coronavirus outbreak Rescuers search for victims at the site of a collapsed hotel in Quanzhou, China, on March 8. The hotel was being used as a coronavirus quarantine center.Hide Caption 64 of 164The Grand Princess cruise ship, carrying at least 21 people who tested positive for coronavirus, is seen off the coast of San Francisco on March 8. <a href="https://www.cnn.com/2020/03/09/health/us-coronavirus-monday/index.html" target="_blank">The ship was being held at sea.</a>The Grand Princess cruise ship, carrying at least 21 people who tested positive for coronavirus, is seen off the coast of San Francisco on March 8. <a href="https://www.cnn.com/2020/03/09/health/us-coronavirus-monday/index.html" target="_blank">The ship was being held at sea.</a> Photos: The novel coronavirus outbreak The Grand Princess cruise ship, carrying at least 21 people who tested positive for coronavirus, is seen off the coast of San Francisco on March 8. The ship was being held at sea.Hide Caption 65 of 164Sumo wrestlers attend a tournament in Osaka, Japan, that was being held behind closed doors because of the coronavirus outbreak.Sumo wrestlers attend a tournament in Osaka, Japan, that was being held behind closed doors because of the coronavirus outbreak. Photos: The novel coronavirus outbreak Sumo wrestlers attend a tournament in Osaka, Japan, that was being held behind closed doors because of the coronavirus outbreak.Hide Caption 66 of 164A couple rides a bicycle at a park in Seoul, South Korea, on March 7. A couple rides a bicycle at a park in Seoul, South Korea, on March 7. Photos: The novel coronavirus outbreak A couple rides a bicycle at a park in Seoul, South Korea, on March 7. Hide Caption 67 of 164A volunteer from Blue Sky Rescue uses fumigation equipment to disinfect a residential compound in Beijing on March 5.A volunteer from Blue Sky Rescue uses fumigation equipment to disinfect a residential compound in Beijing on March 5. Photos: The novel coronavirus outbreak A volunteer from Blue Sky Rescue uses fumigation equipment to disinfect a residential compound in Beijing on March 5.Hide Caption 68 of 164Airmen from the California National Guard drop coronavirus testing kits down to the <a href="https://www.cnn.com/2020/03/05/health/california-coronavirus-cruise-ship-thursday/index.html" target="_blank">Grand Princess cruise ship </a>off the coast of California on March 5.Airmen from the California National Guard drop coronavirus testing kits down to the <a href="https://www.cnn.com/2020/03/05/health/california-coronavirus-cruise-ship-thursday/index.html" target="_blank">Grand Princess cruise ship </a>off the coast of California on March 5. Photos: The novel coronavirus outbreak Airmen from the California National Guard drop coronavirus testing kits down to the Grand Princess cruise ship off the coast of California on March 5.Hide Caption 69 of 164Municipal workers are seen at the Kaaba, inside Mecca's Grand Mosque. Saudi Arabia emptied Islam's holiest site for sterilization over coronavirus fears, an unprecedented move after the kingdom suspended the year-round Umrah pilgrimage.Municipal workers are seen at the Kaaba, inside Mecca's Grand Mosque. Saudi Arabia emptied Islam's holiest site for sterilization over coronavirus fears, an unprecedented move after the kingdom suspended the year-round Umrah pilgrimage. Photos: The novel coronavirus outbreak Municipal workers are seen at the Kaaba, inside Mecca’s Grand Mosque. Saudi Arabia emptied Islam’s holiest site for sterilization over coronavirus fears, an unprecedented move after the kingdom suspended the year-round Umrah pilgrimage.Hide Caption 70 of 164Passengers react as a worker wearing a protective suit disinfects the departure area of a railway station in Hefei, China, on March 4.Passengers react as a worker wearing a protective suit disinfects the departure area of a railway station in Hefei, China, on March 4. Photos: The novel coronavirus outbreak Passengers react as a worker wearing a protective suit disinfects the departure area of a railway station in Hefei, China, on March 4.Hide Caption 71 of 164Teachers at the Nagoya International School in Japan conduct an online class for students staying at home as a precaution against the spread of coronavirus.Teachers at the Nagoya International School in Japan conduct an online class for students staying at home as a precaution against the spread of coronavirus. Photos: The novel coronavirus outbreak Teachers at the Nagoya International School in Japan conduct an online class for students staying at home as a precaution against the spread of coronavirus.Hide Caption 72 of 164Soldiers spray disinfectant throughout a shopping street in Seoul.Soldiers spray disinfectant throughout a shopping street in Seoul. Photos: The novel coronavirus outbreak Soldiers spray disinfectant throughout a shopping street in Seoul.Hide Caption 73 of 164A Muslim worshipper attends a mass prayer against coronavirus in Dakar, Senegal, on March 4. It was after cases were confirmed in the country.A Muslim worshipper attends a mass prayer against coronavirus in Dakar, Senegal, on March 4. It was after cases were confirmed in the country. Photos: The novel coronavirus outbreak A Muslim worshipper attends a mass prayer against coronavirus in Dakar, Senegal, on March 4. It was after cases were confirmed in the country.Hide Caption 74 of 164People wear face masks in New York's Times Square on March 3. New York reported its first case of coronavirus two days earlier. People wear face masks in New York's Times Square on March 3. New York reported its first case of coronavirus two days earlier. Photos: The novel coronavirus outbreak People wear face masks in New York’s Times Square on March 3. New York reported its first case of coronavirus two days earlier. Hide Caption 75 of 164A security guard stands on the Shibuya Sky observation deck in Tokyo on March 3.A security guard stands on the Shibuya Sky observation deck in Tokyo on March 3. Photos: The novel coronavirus outbreak A security guard stands on the Shibuya Sky observation deck in Tokyo on March 3.Hide Caption 76 of 164US President Donald Trump, flanked by Vice President Mike Pence, left, and Health and Human Services Secretary Alex Azar, speaks during a meeting with pharmaceutical executives and the White House coronavirus task force on March 2. Throughout <a href="https://www.cnn.com/2020/03/02/politics/donald-trump-coronavirus-vaccine-push-back/index.html" target="_blank">the meeting,</a> Trump was hyperfocused on pressing industry leaders in the room for a timeline for a coronavirus vaccine and treatment. But experts at the table -- from the administration and the pharmaceutical industry -- repeatedly emphasized that a vaccine can't be rushed to market before it's been declared safe for the public.US President Donald Trump, flanked by Vice President Mike Pence, left, and Health and Human Services Secretary Alex Azar, speaks during a meeting with pharmaceutical executives and the White House coronavirus task force on March 2. Throughout <a href="https://www.cnn.com/2020/03/02/politics/donald-trump-coronavirus-vaccine-push-back/index.html" target="_blank">the meeting,</a> Trump was hyperfocused on pressing industry leaders in the room for a timeline for a coronavirus vaccine and treatment. But experts at the table -- from the administration and the pharmaceutical industry -- repeatedly emphasized that a vaccine can't be rushed to market before it's been declared safe for the public. Photos: The novel coronavirus outbreak US President Donald Trump, flanked by Vice President Mike Pence, left, and Health and Human Services Secretary Alex Azar, speaks during a meeting with pharmaceutical executives and the White House coronavirus task force on March 2. Throughout the meeting, Trump was hyperfocused on pressing industry leaders in the room for a timeline for a coronavirus vaccine and treatment. But experts at the table — from the administration and the pharmaceutical industry — repeatedly emphasized that a vaccine can’t be rushed to market before it’s been declared safe for the public.Hide Caption 77 of 164Medical staff stand outside a hospital in Daegu, South Korea, on March 1.Medical staff stand outside a hospital in Daegu, South Korea, on March 1. Photos: The novel coronavirus outbreak Medical staff stand outside a hospital in Daegu, South Korea, on March 1.Hide Caption 78 of 164Healthcare workers transfer a patient at the Life Care Center in Kirkland, Washington, on March 1. The long-term care facility is linked to confirmed coronavirus cases.Healthcare workers transfer a patient at the Life Care Center in Kirkland, Washington, on March 1. The long-term care facility is linked to confirmed coronavirus cases. Photos: The novel coronavirus outbreak Healthcare workers transfer a patient at the Life Care Center in Kirkland, Washington, on March 1. The long-term care facility is linked to confirmed coronavirus cases.Hide Caption 79 of 164British Prime Minister Boris Johnson visits a London laboratory of the Public Health England National Infection Service.British Prime Minister Boris Johnson visits a London laboratory of the Public Health England National Infection Service. Photos: The novel coronavirus outbreak British Prime Minister Boris Johnson visits a London laboratory of the Public Health England National Infection Service.Hide Caption 80 of 164Tomoyuki Sugano, a professional baseball player on the Yomiuri Giants, throws a pitch in an empty Tokyo Dome during a preseason game on February 29. Fans have been barred from preseason games to prevent the spread of the coronavirus.Tomoyuki Sugano, a professional baseball player on the Yomiuri Giants, throws a pitch in an empty Tokyo Dome during a preseason game on February 29. Fans have been barred from preseason games to prevent the spread of the coronavirus. Photos: The novel coronavirus outbreak Tomoyuki Sugano, a professional baseball player on the Yomiuri Giants, throws a pitch in an empty Tokyo Dome during a preseason game on February 29. Fans have been barred from preseason games to prevent the spread of the coronavirus.Hide Caption 81 of 164Commuters wearing masks make their way to work during morning rush hour at the Shinagawa train station in Tokyo on February 28.Commuters wearing masks make their way to work during morning rush hour at the Shinagawa train station in Tokyo on February 28. Photos: The novel coronavirus outbreak Commuters wearing masks make their way to work during morning rush hour at the Shinagawa train station in Tokyo on February 28.Hide Caption 82 of 164Medical staff transport a coronavirus patient within the Red Cross hospital in Wuhan on February 28. Medical staff transport a coronavirus patient within the Red Cross hospital in Wuhan on February 28. Photos: The novel coronavirus outbreak Medical staff transport a coronavirus patient within the Red Cross hospital in Wuhan on February 28. Hide Caption 83 of 164Inter Milan plays Ludogorets in an empty soccer stadium in Milan, Italy, on February 27. The match <a href="https://edition.cnn.com/2020/02/28/football/inter-milan-coronavirus-ludogorets-football-spt-intl/index.html" target="_blank">was ordered to be played behind closed doors</a> as Italian authorities continue to grapple with the coronavirus outbreak.Inter Milan plays Ludogorets in an empty soccer stadium in Milan, Italy, on February 27. The match <a href="https://edition.cnn.com/2020/02/28/football/inter-milan-coronavirus-ludogorets-football-spt-intl/index.html" target="_blank">was ordered to be played behind closed doors</a> as Italian authorities continue to grapple with the coronavirus outbreak. Photos: The novel coronavirus outbreak Inter Milan plays Ludogorets in an empty soccer stadium in Milan, Italy, on February 27. The match was ordered to be played behind closed doors as Italian authorities continue to grapple with the coronavirus outbreak.Hide Caption 84 of 164A bank clerk disinfects banknotes in China's Sichuan province on February 26.A bank clerk disinfects banknotes in China's Sichuan province on February 26. Photos: The novel coronavirus outbreak A bank clerk disinfects banknotes in China’s Sichuan province on February 26.Hide Caption 85 of 164A child wearing a protective face mask rides on a scooter in an empty area in Beijing.A child wearing a protective face mask rides on a scooter in an empty area in Beijing. Photos: The novel coronavirus outbreak A child wearing a protective face mask rides on a scooter in an empty area in Beijing.Hide Caption 86 of 164A Catholic devotee wears a face mask as he is sprinkled with ash during Ash Wednesday services in Paranaque, Philippines, on February 26.A Catholic devotee wears a face mask as he is sprinkled with ash during Ash Wednesday services in Paranaque, Philippines, on February 26. Photos: The novel coronavirus outbreak A Catholic devotee wears a face mask as he is sprinkled with ash during Ash Wednesday services in Paranaque, Philippines, on February 26.Hide Caption 87 of 164People disinfect Qom's Masumeh shrine in Tehran, Iran, on February 25.People disinfect Qom's Masumeh shrine in Tehran, Iran, on February 25. Photos: The novel coronavirus outbreak People disinfect Qom’s Masumeh shrine in Tehran, Iran, on February 25.Hide Caption 88 of 164A worker in Daegu stacks plastic buckets containing medical waste from coronavirus patients on February 24.A worker in Daegu stacks plastic buckets containing medical waste from coronavirus patients on February 24. Photos: The novel coronavirus outbreak A worker in Daegu stacks plastic buckets containing medical waste from coronavirus patients on February 24.Hide Caption 89 of 164Paramedics carry a stretcher off an ambulance in Hong Kong on February 23.Paramedics carry a stretcher off an ambulance in Hong Kong on February 23. Photos: The novel coronavirus outbreak Paramedics carry a stretcher off an ambulance in Hong Kong on February 23.Hide Caption 90 of 164People attend a professional soccer match in Kobe, Japan, on February 23. To help stop the spread of the novel coronavirus, the soccer club Vissel Kobe <a href="https://www.espn.com/soccer/vissel-kobe/story/4057914/iniestas-vissel-kobe-ban-singing-chanting-due-to-coronavirus-threat" target="_blank">told fans not to sing, chant or wave flags</a> in the season opener against Yokohama FC.People attend a professional soccer match in Kobe, Japan, on February 23. To help stop the spread of the novel coronavirus, the soccer club Vissel Kobe <a href="https://www.espn.com/soccer/vissel-kobe/story/4057914/iniestas-vissel-kobe-ban-singing-chanting-due-to-coronavirus-threat" target="_blank">told fans not to sing, chant or wave flags</a> in the season opener against Yokohama FC. Photos: The novel coronavirus outbreak People attend a professional soccer match in Kobe, Japan, on February 23. To help stop the spread of the novel coronavirus, the soccer club Vissel Kobe told fans not to sing, chant or wave flags in the season opener against Yokohama FC.Hide Caption 91 of 164A team of volunteers disinfects a pedestrian bridge in Bangkok, Thailand.A team of volunteers disinfects a pedestrian bridge in Bangkok, Thailand. Photos: The novel coronavirus outbreak A team of volunteers disinfects a pedestrian bridge in Bangkok, Thailand.Hide Caption 92 of 164A man rides his bike in Beijing on February 23.A man rides his bike in Beijing on February 23. Photos: The novel coronavirus outbreak A man rides his bike in Beijing on February 23.Hide Caption 93 of 164Hospital personnel in Codogno, Italy, carry new beds inside the hospital on February 21. The hospital is hosting some people who have been diagnosed with the novel coronavirus.Hospital personnel in Codogno, Italy, carry new beds inside the hospital on February 21. The hospital is hosting some people who have been diagnosed with the novel coronavirus. Photos: The novel coronavirus outbreak Hospital personnel in Codogno, Italy, carry new beds inside the hospital on February 21. The hospital is hosting some people who have been diagnosed with the novel coronavirus.Hide Caption 94 of 164Doctors look at a CT scan of a lung at a hospital in Xiaogan, China, on February 20.Doctors look at a CT scan of a lung at a hospital in Xiaogan, China, on February 20. Photos: The novel coronavirus outbreak Doctors look at a CT scan of a lung at a hospital in Xiaogan, China, on February 20.Hide Caption 95 of 164A sales clerk wears a mask as she waits for customers at a hat shop in Beijing on February 18.<a href="https://www.cnn.com/2020/02/14/economy/coronavirus-china-economy-small-businesses/index.html" target="_blank"> </a>Small companies that help drive China's economy <a href="https://www.cnn.com/2020/02/14/economy/coronavirus-china-economy-small-businesses/index.html" target="_blank">are worried about how much damage</a> the coronavirus outbreak will cause to business.A sales clerk wears a mask as she waits for customers at a hat shop in Beijing on February 18.<a href="https://www.cnn.com/2020/02/14/economy/coronavirus-china-economy-small-businesses/index.html" target="_blank"> </a>Small companies that help drive China's economy <a href="https://www.cnn.com/2020/02/14/economy/coronavirus-china-economy-small-businesses/index.html" target="_blank">are worried about how much damage</a> the coronavirus outbreak will cause to business. Photos: The novel coronavirus outbreak A sales clerk wears a mask as she waits for customers at a hat shop in Beijing on February 18. Small companies that help drive China’s economy are worried about how much damage the coronavirus outbreak will cause to business.Hide Caption 96 of 164Buses carrying American passengers arrive at the Haneda Airport in Tokyo on February 17. The passengers <a href="https://www.cnn.com/2020/02/17/health/diamond-princess-american-evacuees-flight/index.html" target="_blank">were leaving the quarantined Diamond Princess cruise ship</a> to be repatriated to the United States.Buses carrying American passengers arrive at the Haneda Airport in Tokyo on February 17. The passengers <a href="https://www.cnn.com/2020/02/17/health/diamond-princess-american-evacuees-flight/index.html" target="_blank">were leaving the quarantined Diamond Princess cruise ship</a> to be repatriated to the United States. Photos: The novel coronavirus outbreak Buses carrying American passengers arrive at the Haneda Airport in Tokyo on February 17. The passengers were leaving the quarantined Diamond Princess cruise ship to be repatriated to the United States.Hide Caption 97 of 164A medical worker rests at the isolation ward of the Red Cross hospital in Wuhan on February 16.A medical worker rests at the isolation ward of the Red Cross hospital in Wuhan on February 16. Photos: The novel coronavirus outbreak A medical worker rests at the isolation ward of the Red Cross hospital in Wuhan on February 16.Hide Caption 98 of 164Authorities watch as the Westerdam cruise ship approaches a port in Sihanoukville, Cambodia, on February 13. Despite having no confirmed cases of coronavirus on board, the Westerdam was refused port by four other Asian countries before being allowed to dock in Cambodia.Authorities watch as the Westerdam cruise ship approaches a port in Sihanoukville, Cambodia, on February 13. Despite having no confirmed cases of coronavirus on board, the Westerdam was refused port by four other Asian countries before being allowed to dock in Cambodia. Photos: The novel coronavirus outbreak Authorities watch as the Westerdam cruise ship approaches a port in Sihanoukville, Cambodia, on February 13. Despite having no confirmed cases of coronavirus on board, the Westerdam was refused port by four other Asian countries before being allowed to dock in Cambodia.Hide Caption 99 of 164A worker has his temperature checked on a shuttered commercial street in Beijing on February 12.A worker has his temperature checked on a shuttered commercial street in Beijing on February 12. Photos: The novel coronavirus outbreak A worker has his temperature checked on a shuttered commercial street in Beijing on February 12.Hide Caption 100 of 164Beds are made in the Wuhan Sports Center, which has been converted into a temporary hospital.Beds are made in the Wuhan Sports Center, which has been converted into a temporary hospital. Photos: The novel coronavirus outbreak Beds are made in the Wuhan Sports Center, which has been converted into a temporary hospital.Hide Caption 101 of 164A child rides a scooter past a police officer wearing protective gear outside the Hong Mei House in Hong Kong on February 11. More than 100 people evacuated the housing block after four residents in two different apartments tested positive for the coronavirus.A child rides a scooter past a police officer wearing protective gear outside the Hong Mei House in Hong Kong on February 11. More than 100 people evacuated the housing block after four residents in two different apartments tested positive for the coronavirus. Photos: The novel coronavirus outbreak A child rides a scooter past a police officer wearing protective gear outside the Hong Mei House in Hong Kong on February 11. More than 100 people evacuated the housing block after four residents in two different apartments tested positive for the coronavirus.Hide Caption 102 of 164Relatives of quarantined passengers wave at the Diamond Princess cruise ship as it leaves a port in Yokohama, Japan, to dump wastewater and generate potable water. Dozens of people on the ship <a href="https://www.cnn.com/2020/02/10/us/coronavirus-cruise-ship-americans-quarantine/index.html" target="_blank">were infected with coronavirus.</a>Relatives of quarantined passengers wave at the Diamond Princess cruise ship as it leaves a port in Yokohama, Japan, to dump wastewater and generate potable water. Dozens of people on the ship <a href="https://www.cnn.com/2020/02/10/us/coronavirus-cruise-ship-americans-quarantine/index.html" target="_blank">were infected with coronavirus.</a> Photos: The novel coronavirus outbreak Relatives of quarantined passengers wave at the Diamond Princess cruise ship as it leaves a port in Yokohama, Japan, to dump wastewater and generate potable water. Dozens of people on the ship were infected with coronavirus.Hide Caption 103 of 164The Deneway branch of the County Oak Medical Centre is closed amid coronavirus fears in Brighton, England, on February 11. Several locations in and around Brighton were quarantined after <a href="https://www.cnn.com/2020/02/11/europe/steve-walsh-uk-coronavirus-patient-intl-gbr/index.html" target="_blank">a man linked to several coronavirus cases in the United Kingdom</a> came into contact with health-care workers and members of the public.The Deneway branch of the County Oak Medical Centre is closed amid coronavirus fears in Brighton, England, on February 11. Several locations in and around Brighton were quarantined after <a href="https://www.cnn.com/2020/02/11/europe/steve-walsh-uk-coronavirus-patient-intl-gbr/index.html" target="_blank">a man linked to several coronavirus cases in the United Kingdom</a> came into contact with health-care workers and members of the public. Photos: The novel coronavirus outbreak The Deneway branch of the County Oak Medical Centre is closed amid coronavirus fears in Brighton, England, on February 11. Several locations in and around Brighton were quarantined after a man linked to several coronavirus cases in the United Kingdom came into contact with health-care workers and members of the public.Hide Caption 104 of 164A police officer, left, wears protective gear as he guards a cordon at the Hong Mei House in Hong Kong on February 11.A police officer, left, wears protective gear as he guards a cordon at the Hong Mei House in Hong Kong on February 11. Photos: The novel coronavirus outbreak A police officer, left, wears protective gear as he guards a cordon at the Hong Mei House in Hong Kong on February 11.Hide Caption 105 of 164A worker wears a protective suit as he waits to screen people entering an office building in Beijing on February 10. China's workforce is <a href="https://edition.cnn.com/2020/02/10/business/china-companies-return-to-work-coronavirus/index.html" target="_blank">slowly coming back to work</a> after the coronavirus outbreak forced many parts of the country to extend the Lunar New Year holiday by more than a week.A worker wears a protective suit as he waits to screen people entering an office building in Beijing on February 10. China's workforce is <a href="https://edition.cnn.com/2020/02/10/business/china-companies-return-to-work-coronavirus/index.html" target="_blank">slowly coming back to work</a> after the coronavirus outbreak forced many parts of the country to extend the Lunar New Year holiday by more than a week. Photos: The novel coronavirus outbreak A worker wears a protective suit as he waits to screen people entering an office building in Beijing on February 10. China’s workforce is slowly coming back to work after the coronavirus outbreak forced many parts of the country to extend the Lunar New Year holiday by more than a week.Hide Caption 106 of 164Chinese President Xi Jinping has his temperature checked during an appearance in Beijing on February 10.Chinese President Xi Jinping has his temperature checked during an appearance in Beijing on February 10. Photos: The novel coronavirus outbreak Chinese President Xi Jinping has his temperature checked during an appearance in Beijing on February 10.Hide Caption 107 of 164Photojournalists wearing face masks take photos of a bus carrying passengers after they disembarked from the World Dream cruise ship in Hong Kong on February 9. <a href="https://www.cnn.com/2020/02/05/asia/coronavirus-cruise-quarantines-intl-hnk/index.html" target="_blank">More than 5,300 people were quarantined on two cruise ships</a> off Hong Kong and Japan.Photojournalists wearing face masks take photos of a bus carrying passengers after they disembarked from the World Dream cruise ship in Hong Kong on February 9. <a href="https://www.cnn.com/2020/02/05/asia/coronavirus-cruise-quarantines-intl-hnk/index.html" target="_blank">More than 5,300 people were quarantined on two cruise ships</a> off Hong Kong and Japan. Photos: The novel coronavirus outbreak Photojournalists wearing face masks take photos of a bus carrying passengers after they disembarked from the World Dream cruise ship in Hong Kong on February 9. More than 5,300 people were quarantined on two cruise ships off Hong Kong and Japan.Hide Caption 108 of 164People participating in a Lunar New Year Parade in New York City hold signs reading, "Wuhan stay strong!" on February 9.People participating in a Lunar New Year Parade in New York City hold signs reading, "Wuhan stay strong!" on February 9. Photos: The novel coronavirus outbreak People participating in a Lunar New Year Parade in New York City hold signs reading, “Wuhan stay strong!” on February 9.Hide Caption 109 of 164A shopper walks past empty shelves at a grocery store in Hong Kong on February 9. China's Ministry of Commerce <a href="https://www.cnn.com/2020/02/06/asia/wuhan-coronavirus-update-intl-hnk/index.html" target="_blank">encouraged supermarkets and grocery stores</a> to resume operations as the country's voluntary or mandatory quarantines began to take an economic toll. A shopper walks past empty shelves at a grocery store in Hong Kong on February 9. China's Ministry of Commerce <a href="https://www.cnn.com/2020/02/06/asia/wuhan-coronavirus-update-intl-hnk/index.html" target="_blank">encouraged supermarkets and grocery stores</a> to resume operations as the country's voluntary or mandatory quarantines began to take an economic toll. Photos: The novel coronavirus outbreak A shopper walks past empty shelves at a grocery store in Hong Kong on February 9. China’s Ministry of Commerce encouraged supermarkets and grocery stores to resume operations as the country’s voluntary or mandatory quarantines began to take an economic toll. Hide Caption 110 of 164A worker wearing a protective suit uses a machine to disinfect a business establishment in Shanghai, China, on February 9.A worker wearing a protective suit uses a machine to disinfect a business establishment in Shanghai, China, on February 9. Photos: The novel coronavirus outbreak A worker wearing a protective suit uses a machine to disinfect a business establishment in Shanghai, China, on February 9.Hide Caption 111 of 164Workers in protective gear walk near the Diamond Princess cruise ship docked in Yokohama on February 7.Workers in protective gear walk near the Diamond Princess cruise ship docked in Yokohama on February 7. Photos: The novel coronavirus outbreak Workers in protective gear walk near the Diamond Princess cruise ship docked in Yokohama on February 7.Hide Caption 112 of 164People in Hong Kong attend a vigil February 7 for <a href="https://edition.cnn.com/2020/02/07/asia/china-doctor-death-censorship-intl-hnk/index.html" target="_blank">whistleblower doctor Li Wenliang. </a>Li, 34, died in Wuhan after contracting the virus while treating a patient.People in Hong Kong attend a vigil February 7 for <a href="https://edition.cnn.com/2020/02/07/asia/china-doctor-death-censorship-intl-hnk/index.html" target="_blank">whistleblower doctor Li Wenliang. </a>Li, 34, died in Wuhan after contracting the virus while treating a patient. Photos: The novel coronavirus outbreak People in Hong Kong attend a vigil February 7 for whistleblower doctor Li Wenliang. Li, 34, died in Wuhan after contracting the virus while treating a patient.Hide Caption 113 of 164A woman grieves while paying tribute to Li at Li's hospital in Wuhan on February 7.A woman grieves while paying tribute to Li at Li's hospital in Wuhan on February 7. Photos: The novel coronavirus outbreak A woman grieves while paying tribute to Li at Li’s hospital in Wuhan on February 7.Hide Caption 114 of 164The Anthem of the Seas cruise ship is seen docked at the Cape Liberty Cruise Port in Bayonne, New Jersey, on February 7. Passengers were to be screened for coronavirus as a precaution, an official with the Centers for Disease Control and Prevention told CNN.The Anthem of the Seas cruise ship is seen docked at the Cape Liberty Cruise Port in Bayonne, New Jersey, on February 7. Passengers were to be screened for coronavirus as a precaution, an official with the Centers for Disease Control and Prevention told CNN. Photos: The novel coronavirus outbreak The Anthem of the Seas cruise ship is seen docked at the Cape Liberty Cruise Port in Bayonne, New Jersey, on February 7. Passengers were to be screened for coronavirus as a precaution, an official with the Centers for Disease Control and Prevention told CNN.Hide Caption 115 of 164A light installation is displayed by striking members of the Hospital Authority Employees Alliance and other activists at the Hospital Authority building in Hong Kong on February 7.A light installation is displayed by striking members of the Hospital Authority Employees Alliance and other activists at the Hospital Authority building in Hong Kong on February 7. Photos: The novel coronavirus outbreak A light installation is displayed by striking members of the Hospital Authority Employees Alliance and other activists at the Hospital Authority building in Hong Kong on February 7.Hide Caption 116 of 164Passengers are seen on the deck of the Diamond Princess cruise ship, docked at the Yokohama Port on February 7.Passengers are seen on the deck of the Diamond Princess cruise ship, docked at the Yokohama Port on February 7. Photos: The novel coronavirus outbreak Passengers are seen on the deck of the Diamond Princess cruise ship, docked at the Yokohama Port on February 7.Hide Caption 117 of 164Flight attendants wearing face masks make their way through Don Mueang Airport in Bangkok on February 7.Flight attendants wearing face masks make their way through Don Mueang Airport in Bangkok on February 7. Photos: The novel coronavirus outbreak Flight attendants wearing face masks make their way through Don Mueang Airport in Bangkok on February 7.Hide Caption 118 of 164Workers check sterile medical gloves at a latex-product manufacturer in Nanjing, China, on February 6.Workers check sterile medical gloves at a latex-product manufacturer in Nanjing, China, on February 6. Photos: The novel coronavirus outbreak Workers check sterile medical gloves at a latex-product manufacturer in Nanjing, China, on February 6.Hide Caption 119 of 164A woman wears a protective mask as she shops in a Beijing market on February 6.A woman wears a protective mask as she shops in a Beijing market on February 6. Photos: The novel coronavirus outbreak A woman wears a protective mask as she shops in a Beijing market on February 6.Hide Caption 120 of 164This aerial photo shows the Leishenshan Hospital that is being built in Wuhan to handle coronavirus patients.This aerial photo shows the Leishenshan Hospital that is being built in Wuhan to handle coronavirus patients. Photos: The novel coronavirus outbreak This aerial photo shows the Leishenshan Hospital that is being built in Wuhan to handle coronavirus patients.Hide Caption 121 of 164A passenger shows a note from the World Dream cruise ship docked at the Kai Tak cruise terminal in Hong Kong on February 5.A passenger shows a note from the World Dream cruise ship docked at the Kai Tak cruise terminal in Hong Kong on February 5. Photos: The novel coronavirus outbreak A passenger shows a note from the World Dream cruise ship docked at the Kai Tak cruise terminal in Hong Kong on February 5.Hide Caption 122 of 164A mask is seen on a statue in Beijing on February 5.A mask is seen on a statue in Beijing on February 5. Photos: The novel coronavirus outbreak A mask is seen on a statue in Beijing on February 5.Hide Caption 123 of 164An ambulance stops at a traffic light in front of the Grand Lisboa Hotel in Macao. The virus turned China's gambling mecca <a href="https://www.cnn.com/2020/02/03/asia/china-virus-macao-gambling-intl-hnk/index.html" target="_blank">into a ghost town.</a>An ambulance stops at a traffic light in front of the Grand Lisboa Hotel in Macao. The virus turned China's gambling mecca <a href="https://www.cnn.com/2020/02/03/asia/china-virus-macao-gambling-intl-hnk/index.html" target="_blank">into a ghost town.</a> Photos: The novel coronavirus outbreak An ambulance stops at a traffic light in front of the Grand Lisboa Hotel in Macao. The virus turned China’s gambling mecca into a ghost town.Hide Caption 124 of 164A dog in Beijing wears a makeshift mask constructed from a paper cup.A dog in Beijing wears a makeshift mask constructed from a paper cup. Photos: The novel coronavirus outbreak A dog in Beijing wears a makeshift mask constructed from a paper cup.Hide Caption 125 of 164Striking hospital workers in Hong Kong demand the closure of the border with mainland China on February 4.Striking hospital workers in Hong Kong demand the closure of the border with mainland China on February 4. Photos: The novel coronavirus outbreak Striking hospital workers in Hong Kong demand the closure of the border with mainland China on February 4.Hide Caption 126 of 164The Diamond Princess cruise ship sits anchored in quarantine off the port of Yokohama on February 4. It arrived a day earlier with passengers feeling ill.The Diamond Princess cruise ship sits anchored in quarantine off the port of Yokohama on February 4. It arrived a day earlier with passengers feeling ill. Photos: The novel coronavirus outbreak The Diamond Princess cruise ship sits anchored in quarantine off the port of Yokohama on February 4. It arrived a day earlier with passengers feeling ill.Hide Caption 127 of 164A medical worker wearing protective gear waits to take the temperature of people entering Princess Margaret Hospital in Hong Kong on February 4.A medical worker wearing protective gear waits to take the temperature of people entering Princess Margaret Hospital in Hong Kong on February 4. Photos: The novel coronavirus outbreak A medical worker wearing protective gear waits to take the temperature of people entering Princess Margaret Hospital in Hong Kong on February 4.Hide Caption 128 of 164Medical workers in protective suits help transfer patients to a newly completed field hospital in Wuhan.Medical workers in protective suits help transfer patients to a newly completed field hospital in Wuhan. Photos: The novel coronavirus outbreak Medical workers in protective suits help transfer patients to a newly completed field hospital in Wuhan.Hide Caption 129 of 164People wearing protective overalls talk outside a Wuhan hotel housing people in isolation on February 3.People wearing protective overalls talk outside a Wuhan hotel housing people in isolation on February 3. Photos: The novel coronavirus outbreak People wearing protective overalls talk outside a Wuhan hotel housing people in isolation on February 3.Hide Caption 130 of 164A man stands in front of TV screens broadcasting a speech by Hong Kong Chief Executive Carrie Lam on February 3. Lam said the city would shut almost all border-control points to the mainland.A man stands in front of TV screens broadcasting a speech by Hong Kong Chief Executive Carrie Lam on February 3. Lam said the city would shut almost all border-control points to the mainland. Photos: The novel coronavirus outbreak A man stands in front of TV screens broadcasting a speech by Hong Kong Chief Executive Carrie Lam on February 3. Lam said the city would shut almost all border-control points to the mainland.Hide Caption 131 of 164A colleague sprays disinfectant on a doctor in Wuhan on February 3.A colleague sprays disinfectant on a doctor in Wuhan on February 3. Photos: The novel coronavirus outbreak A colleague sprays disinfectant on a doctor in Wuhan on February 3.Hide Caption 132 of 164Commuters in Tokyo walk past an electric board displaying dismal stock prices on February 3, the first business day after the Chinese New Year. Asia's markets recorded their <a href="https://www.cnn.com/2020/02/02/investing/china-markets-coronavirus/index.html" target="_blank">worst day in years</a> as investors finally got a chance to react to the worsening coronavirus outbreak.Commuters in Tokyo walk past an electric board displaying dismal stock prices on February 3, the first business day after the Chinese New Year. Asia's markets recorded their <a href="https://www.cnn.com/2020/02/02/investing/china-markets-coronavirus/index.html" target="_blank">worst day in years</a> as investors finally got a chance to react to the worsening coronavirus outbreak. Photos: The novel coronavirus outbreak Commuters in Tokyo walk past an electric board displaying dismal stock prices on February 3, the first business day after the Chinese New Year. Asia’s markets recorded their worst day in years as investors finally got a chance to react to the worsening coronavirus outbreak.Hide Caption 133 of 164Medical workers move a coronavirus patient into an isolation ward at the Second People's Hospital in Fuyang, China, on February 1.Medical workers move a coronavirus patient into an isolation ward at the Second People's Hospital in Fuyang, China, on February 1. Photos: The novel coronavirus outbreak Medical workers move a coronavirus patient into an isolation ward at the Second People’s Hospital in Fuyang, China, on February 1.Hide Caption 134 of 164Children wear plastic bottles as makeshift masks while waiting to check in to a flight at the Beijing Capital Airport on January 30.Children wear plastic bottles as makeshift masks while waiting to check in to a flight at the Beijing Capital Airport on January 30. Photos: The novel coronavirus outbreak Children wear plastic bottles as makeshift masks while waiting to check in to a flight at the Beijing Capital Airport on January 30.Hide Caption 135 of 164Passengers in Hong Kong wear protective masks as they wait to board a train at Lo Wu Station, near the mainland border, on January 30. Passengers in Hong Kong wear protective masks as they wait to board a train at Lo Wu Station, near the mainland border, on January 30. Photos: The novel coronavirus outbreak Passengers in Hong Kong wear protective masks as they wait to board a train at Lo Wu Station, near the mainland border, on January 30. Hide Caption 136 of 164A volunteer wearing protective clothing disinfects a street in Qingdao, China, on January 29.A volunteer wearing protective clothing disinfects a street in Qingdao, China, on January 29. Photos: The novel coronavirus outbreak A volunteer wearing protective clothing disinfects a street in Qingdao, China, on January 29.Hide Caption 137 of 164Nanning residents line up to buy face masks from a medical appliance store on January 29.Nanning residents line up to buy face masks from a medical appliance store on January 29. Photos: The novel coronavirus outbreak Nanning residents line up to buy face masks from a medical appliance store on January 29.Hide Caption 138 of 164Lyu Jun, left, a member of a medical team leaving for Wuhan, says goodbye to a loved one in Urumqi, China, on January 28.Lyu Jun, left, a member of a medical team leaving for Wuhan, says goodbye to a loved one in Urumqi, China, on January 28. Photos: The novel coronavirus outbreak Lyu Jun, left, a member of a medical team leaving for Wuhan, says goodbye to a loved one in Urumqi, China, on January 28.Hide Caption 139 of 164A charter flight from Wuhan arrives at an airport in Anchorage, Alaska, on January 28. The US government chartered the plane to bring home US citizens and diplomats from the American consulate in Wuhan.A charter flight from Wuhan arrives at an airport in Anchorage, Alaska, on January 28. The US government chartered the plane to bring home US citizens and diplomats from the American consulate in Wuhan. Photos: The novel coronavirus outbreak A charter flight from Wuhan arrives at an airport in Anchorage, Alaska, on January 28. The US government chartered the plane to bring home US citizens and diplomats from the American consulate in Wuhan.Hide Caption 140 of 164South Korean President Moon Jae-in wears a mask to inspect the National Medical Center in Seoul on January 28.South Korean President Moon Jae-in wears a mask to inspect the National Medical Center in Seoul on January 28. Photos: The novel coronavirus outbreak South Korean President Moon Jae-in wears a mask to inspect the National Medical Center in Seoul on January 28.Hide Caption 141 of 164Hong Kong Chief Executive Carrie Lam, center, attends a news conference in Hong Kong on January 28. Lam said China will stop individual travelers to Hong Kong while closing some border checkpoints and restricting flights and train services from the mainland.Hong Kong Chief Executive Carrie Lam, center, attends a news conference in Hong Kong on January 28. Lam said China will stop individual travelers to Hong Kong while closing some border checkpoints and restricting flights and train services from the mainland. Photos: The novel coronavirus outbreak Hong Kong Chief Executive Carrie Lam, center, attends a news conference in Hong Kong on January 28. Lam said China will stop individual travelers to Hong Kong while closing some border checkpoints and restricting flights and train services from the mainland.Hide Caption 142 of 164Workers at an airport in Novosibirsk, Russia, check the temperatures of passengers who arrived from Beijing on January 28.Workers at an airport in Novosibirsk, Russia, check the temperatures of passengers who arrived from Beijing on January 28. Photos: The novel coronavirus outbreak Workers at an airport in Novosibirsk, Russia, check the temperatures of passengers who arrived from Beijing on January 28.Hide Caption 143 of 164Alex Azar, the US Secretary of Health and Human Services, speaks during a news conference about the American public-health response.Alex Azar, the US Secretary of Health and Human Services, speaks during a news conference about the American public-health response. Photos: The novel coronavirus outbreak Alex Azar, the US Secretary of Health and Human Services, speaks during a news conference about the American public-health response.Hide Caption 144 of 164Two residents walk in an empty park in Wuhan on January 27. The city remained on lockdown for a fourth day.Two residents walk in an empty park in Wuhan on January 27. The city remained on lockdown for a fourth day. Photos: The novel coronavirus outbreak Two residents walk in an empty park in Wuhan on January 27. The city remained on lockdown for a fourth day.Hide Caption 145 of 164A person wears a protective mask, goggles and coat as he stands in a nearly empty street in Beijing on January 26.A person wears a protective mask, goggles and coat as he stands in a nearly empty street in Beijing on January 26. Photos: The novel coronavirus outbreak A person wears a protective mask, goggles and coat as he stands in a nearly empty street in Beijing on January 26.Hide Caption 146 of 164Medical staff members bring a patient to the Wuhan Red Cross hospital on January 25.Medical staff members bring a patient to the Wuhan Red Cross hospital on January 25. Photos: The novel coronavirus outbreak Medical staff members bring a patient to the Wuhan Red Cross hospital on January 25.Hide Caption 147 of 164People wear protective masks as they walk under Lunar New Year decorations in Beijing on January 25.People wear protective masks as they walk under Lunar New Year decorations in Beijing on January 25. Photos: The novel coronavirus outbreak People wear protective masks as they walk under Lunar New Year decorations in Beijing on January 25.Hide Caption 148 of 164Construction workers in Wuhan begin to work on a special hospital to deal with the outbreak on January 24.Construction workers in Wuhan begin to work on a special hospital to deal with the outbreak on January 24. Photos: The novel coronavirus outbreak Construction workers in Wuhan begin to work on a special hospital to deal with the outbreak on January 24.Hide Caption 149 of 164Dr. Allison Arwady, commissioner of the Chicago Department of Public Health, speaks to reporters on January 24 about <a href="https://www.cnn.com/2020/01/24/health/wuhan-coronavirus-chicago-cdc/index.html" target="_blank">a patient in Chicago</a> who had been diagnosed with the coronavirus. The patient was the second in the United States to be diagnosed with the illness. Dr. Allison Arwady, commissioner of the Chicago Department of Public Health, speaks to reporters on January 24 about <a href="https://www.cnn.com/2020/01/24/health/wuhan-coronavirus-chicago-cdc/index.html" target="_blank">a patient in Chicago</a> who had been diagnosed with the coronavirus. The patient was the second in the United States to be diagnosed with the illness. Photos: The novel coronavirus outbreak Dr. Allison Arwady, commissioner of the Chicago Department of Public Health, speaks to reporters on January 24 about a patient in Chicago who had been diagnosed with the coronavirus. The patient was the second in the United States to be diagnosed with the illness. Hide Caption 150 of 164A couple kisses goodbye as they travel for the Lunar New Year holiday in Beijing on January 24.A couple kisses goodbye as they travel for the Lunar New Year holiday in Beijing on January 24. Photos: The novel coronavirus outbreak A couple kisses goodbye as they travel for the Lunar New Year holiday in Beijing on January 24.Hide Caption 151 of 164Workers manufacture protective face masks at a factory in China's Hubei Province on January 23.Workers manufacture protective face masks at a factory in China's Hubei Province on January 23. Photos: The novel coronavirus outbreak Workers manufacture protective face masks at a factory in China’s Hubei Province on January 23.Hide Caption 152 of 164Shoppers wear masks in a Wuhan market on January 23.Shoppers wear masks in a Wuhan market on January 23. Photos: The novel coronavirus outbreak Shoppers wear masks in a Wuhan market on January 23.Hide Caption 153 of 164Passengers are checked by a thermography device at an airport in Osaka, Japan, on January 23.Passengers are checked by a thermography device at an airport in Osaka, Japan, on January 23. Photos: The novel coronavirus outbreak Passengers are checked by a thermography device at an airport in Osaka, Japan, on January 23.Hide Caption 154 of 164People wear masks while shopping for vegetables in Wuhan on January 23.People wear masks while shopping for vegetables in Wuhan on January 23. Photos: The novel coronavirus outbreak People wear masks while shopping for vegetables in Wuhan on January 23.Hide Caption 155 of 164A militia member checks the body temperature of a driver in Wuhan on January 23.A militia member checks the body temperature of a driver in Wuhan on January 23. Photos: The novel coronavirus outbreak A militia member checks the body temperature of a driver in Wuhan on January 23.Hide Caption 156 of 164Passengers wear masks as they arrive at the Ninoy Aquino International Airport in Manila, Philippines, on January 23.Passengers wear masks as they arrive at the Ninoy Aquino International Airport in Manila, Philippines, on January 23. Photos: The novel coronavirus outbreak Passengers wear masks as they arrive at the Ninoy Aquino International Airport in Manila, Philippines, on January 23.Hide Caption 157 of 164A customer holds boxes of particulate respirators at a pharmacy in Hong Kong on January 23.A customer holds boxes of particulate respirators at a pharmacy in Hong Kong on January 23. Photos: The novel coronavirus outbreak A customer holds boxes of particulate respirators at a pharmacy in Hong Kong on January 23.Hide Caption 158 of 164Passengers wear masks at the high-speed train station in Hong Kong on January 23.Passengers wear masks at the high-speed train station in Hong Kong on January 23. Photos: The novel coronavirus outbreak Passengers wear masks at the high-speed train station in Hong Kong on January 23.Hide Caption 159 of 164A woman rides an electric bicycle in Wuhan on January 22.A woman rides an electric bicycle in Wuhan on January 22. Photos: The novel coronavirus outbreak A woman rides an electric bicycle in Wuhan on January 22.Hide Caption 160 of 164People in Guangzhou, China, wear protective masks on January 22.People in Guangzhou, China, wear protective masks on January 22. Photos: The novel coronavirus outbreak People in Guangzhou, China, wear protective masks on January 22.Hide Caption 161 of 164People go through a checkpoint in Guangzhou on January 22.People go through a checkpoint in Guangzhou on January 22. Photos: The novel coronavirus outbreak People go through a checkpoint in Guangzhou on January 22.Hide Caption 162 of 164Medical staff of Wuhan's Union Hospital attend a gathering on January 22.Medical staff of Wuhan's Union Hospital attend a gathering on January 22. Photos: The novel coronavirus outbreak Medical staff of Wuhan’s Union Hospital attend a gathering on January 22.Hide Caption 163 of 164Health officials hold a news conference in Beijing on January 22.Health officials hold a news conference in Beijing on January 22. Photos: The novel coronavirus outbreak Health officials hold a news conference in Beijing on January 22.Hide Caption 164 of 16401 coronavirus ITALY 032602 coronavirus LOS ANGELES 032701 coronavirus VATICAN 032701 coronavirus MANCHESTER 032601 coronavirus iran 0325 RESTRICTED 01 coronavirus new york 032503 coronavirus 0325 beijing04 coronavirus 0325 Fukushima01 coronavirus 0324 bangkok04 coronavirus 0324 madrid01 great wall of china reopens 032402 coronavirus 0323 spain01 coronavirus 0323 thailand04 coronavirus 0323 hong kong01c coronavirus italy 032201 coronavirus MUMBAI 032201 coronavirus KENYA 032201 coronavirus SYRIA 032203 california beach coronavirus 032102 coronavirus 0321 Italy03 coronavirus 0321 syria01 coronavirus 0320 new york01 coronavirus 0318 brazil01 coronavirus 0318 moscow01 coronavirus social distancing minyan10 coronavirus 0317 rome04 coronavirus 0317 brooklyn06 coronavirus 0317 new delhi03 coronavirus 0317 new york05 coronavirus 0317 thailand09 coronavirus 0317 melbourne07 coronavirus 0316 malaga06 coronavirus 0316 idlib01 Macron coronavirus statement 031602 coronavirus 0316 manila01 coronavirus 0316 Netherlands01 coronavirus BANGKOK 031311 coronavirus 0315 turin01 pope francis crucifix 031506 coronavirus 0315 morocco04 coronavirus 0315 white house briefing01 coronavirus 0314 indonesia01 DFW coronavirus 031401 coronavirus shopping costco California02 WH briefing temperature test 0314coronavirus cremona italy nurses 031301 coronavirus outbreak 0313 pentagon02 broadway coronavirus 031301 coronavirus CALIFORNIA 031301 coronavirus BARCELONA 031301 coronavirus ANTWERP 031301 coronavirus ATHENS 031301 coronavirus JAMMU 031301 coronavirus MOSCOW 031301 coronavirus RED WINGS 031201 coronavirus SNOHOMISH WA 031201 coronavirus ROME 031206 trump oval office address 031201 coronavirus ISTANBUL 031101 coronavirus 0311 beijing01 italy SantAnna prison riot 030901 coronavirus 0309 wuhan22 stock market 0309 new york04 hotel collapse china 030801 grand princess cruise california 030801 coronavirus osaka japan 0308coronavirus 0307 seoul01 coronavirus beijing china 030503 california cruise coronavirus 030501 coronavirus mecca 030502 coronavirus 0304 china01 coronavirus japan 030501 coronavirus 0304 seoul 01 coronavirus senegal 0304coronavirus new york times square RESTRICTED03 coronavirus 0303 tokyotrump coronavirus task force 030201 coronavirus south korea 030104 coronavirus 0301 washington state01 coronavirus UK 030104 coronavirus tokyo 0229coronavirus tokyo 022801 coronavirus wuhan 022806 coronavirus milan 022703 coronavirus 0226 sichuan money01 coronavirus 0226 beijing01 philippines ash wednesday coronavirus 022602 iran coronavirus 022605 coronavirus 0224 south korea01 coronavirus hong kong 022301 coronavirus japan 022301 coronavirus thailand 022401 coronavirus beijing 022301 coronavirus codogno italy01 coronavirus hubei 022004 coronavirus 0218 beijing02 coronavirus US plane 0216 japan01 coronavirus 0216 wuhan02 coronavirus 0213 westerdam cambodia05 coronavirus 0212 beijing08 coronavirus 021205 coronavirus 0211 hong kong03 coronavirus 0212 yokohama02 coronavirus 0211 brighton UK03 coronavirus 0211 hong kong05 coronavirus 0210 beijing04 coronavirus 0210 xi jinping05 coronavirus 0209 hong kong07 coronavirus 0209 new york01 coronavirus 020903 coronavirus 020903 coronavirus 0207 yokohama RESTRICTED03 Li Wenliang tribute 020706 Li Wenliang tribute 020704 coronavirus 0207 new jersey09 coronavirus 0207 hong kong07 coronavirus 0207 yokohama08 coronavirus 0207 bangkok10 coronavirus 0207 nanjing01 coronavirus 0206 beijingLeishenshan Hospital 020503 coronavirus 0205 hong kong04 coronavirus 0205 beijing08 coronavirus 0204 macau01 coronavirus 0204 beijing05 coronavirus 0204 hong kong RESTRICTED03 coronavirus 0204 yokohama04 coronavirus 0204 hong kong07 coronavirus 0204 wuhan01 coronavirus 0203 wuhan RESTRICTED05 coronavirus 0203 hong kongwuhan coronavirus 020307 coronavirus 0203 tokyo japan RESTRICTED02 coronavirus 0201 Fuyang China01 coronavirus 0130 beijing03 coronavirus 0130 hong kong restricted03 coronavirus outbreak 0129 Qingdao04 coronavirus outbreak 0129 Nanning01 coronavirus outbreak 0128 Xinjiang02 us coronavirus alaska flight01 coronavirus 012801 coronavirus 0128 RESTRICTED02 coronavirus 012702 coronavirus 0128 restricted02 wuhan coronavirus 012701 coronavirus beijing 012604b coronavirus 0125 wuhan COPY01 coronavirus 012501 coronavirus 012404 coronavirus 05 coronavirus 0124 beijing 02 coronavirus 0124 RESTRICTED06 coronavirus08 coronavirus10 coronavirus11 coronavirus RESTRICTED12 coronavirus13 coronavirus RESTRICTED14 coronavirus RESTRICTED02 coronavirus04 coronavirus RESTRICTED05 coronavirus RESTRICTED07 coronavirus RESTRICTED09 coronavirus RESTRICTEDEven companies that traditionally make egg-based flu vaccines are jumping into the mix; Sanofi Pasteur said in February it was working on a non-egg coronavirus vaccine.Health officials warn it will take at least a year before any coronavirus vaccine is proven effective and gets necessary approvals for widespread distribution.Typically, clinical trials are broken into two phases. Phase 1, involving a few dozen people, would last about three months. Phase 2, involving hundreds of people, would last another six to eight months.At least one Phase 1 coronavirus vaccine trial has now begun; the US study gave a dose to the first participant on March 17. Over six weeks, each participant will receive two injections about a month apart in varying doses, to try to establish that the vaccine is safe and induces a desired response from participants’ immune systems.There is still a lot we don’t know about the coronavirus, said Poon — so the wide range of technologies being used to develop vaccines gives us a better shot at finding one that works.”That’s why I say I appreciate diversity,” he said. “You never know which one is going to work — it’s dangerous to put all the eggs in one basket.”

Source Link:
https://www.cnn.com/2020/03/27/health/chicken-egg-flu-vaccine-intl-hnk-scli/index.html

400 Request Header Or Cookie Too Large

400 Bad Request

Request Header Or Cookie Too Large

Comments

comments

Advertisement