Students pray for the victims of coronavirus at a school in Chandigarh, India, on Jan. 31.

Slide 31 of 94: Students pray for the victims of coronavirus at a school in Chandigarh, India, January 31, 2020. REUTERS/Ajay Verma
Slide 39 of 94: Passengers are seen onboard the Costa Smeralda cruise ship of Costa Crociere, carrying around 6,000 passengers, as it sits docked at the Italian port of Civitavecchia following a health alert due to a Chinese couple and a possible link to coronavirus, in Civitavecchia, Italy, January 30, 2020. REUTERS/Guglielmo Mangiapane
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Passengers are seen onboard the Costa Smeralda cruise ship as it sits docked at the Italian port of Civitavecchia on Jan. 30. The ship was quarantined over fears of coronavirus but the passengers were allowed to disembark later. 
Slide 44 of 94: A worker uses a thermometer to check the temperature of a customer as she enters a Starbucks shop as the country is hit by an outbreak of the new coronavirus, in Beijing, China January 30, 2020. REUTERS/Carlos Garcia Rawlins
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A worker uses a thermometer to check the temperature of a customer as she enters a Starbucks shop in Beijing, on Jan. 30.
Slide 51 of 94: Passengers from China wearing masks to prevent a new coronavirus are checked by Saudi Health Ministry employees upon their arrival at King Khalid International Airport, in Riyadh, Saudi Arabia January 29, 2020. REUTERS /Ahmed Yosri
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Passengers from China are checked by Saudi Health Ministry employees upon their arrival at King Khalid International Airport in Riyadh, Saudi Arabia, on Jan. 29. 
Slide 52 of 94: AUCKLAND, NEW ZEALAND - JANUARY 29: Passengers arriving on flights wear protective masks at the international airport on January 29, 2020 in Auckland, New Zealand. There have been no confirmed cases of coronavirus in New Zealand, however health authorities remain on high alert as more cases of the deadly flu-like virus are confirmed around the world. The coronavirus, which originated in Wuhan, China, has now killed 132 people - mostly in China - and as of Wednesday morning had 6,000 confirmed cases while thousands more people remain under observation.  (Photo by Dave Rowland/Getty Images)
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Passengers arriving on flights wear protective masks at the international airport in Auckland, New Zealand, on Jan. 29. 
Slide 55 of 94: Bavarian state minister for health and nursing Melanie Huml attends a news conference, Munich, Germany, Tuesday, Jan. 28, 2020. Germany has declared its first confirmed case of the deadly coronavirus that broke out in China. (AP Photo/Matthias Schrader)
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Bavarian state minister for health and nursing Melanie Huml attends a news conference in Munich, Germany, on Jan. 28, as the country declared its first confirmed case of coronavirus.
Slide 68 of 94: Hong Kong Chief Executive Carrie Lam is seen during a press conference in the Central Government Officer on January 25, 2020 in Hong Kong, China. Hong Kong steps up protective measures against the new deadly China Coronavirus which has infected over 1300 and killed 41 in China and with 5 confirmed cases reported in Hong Kong. The city which has been hit hard in 2003 with the outbreak SARS ( Severe Acute Respiratory Syndrome) which killed 299 in Hong Kong, the Hong Kong Government has declared the highest level of emergency in response to the Chian coronavirus 2019-nCoV. (Photo by Vernon Yuen/NurPhoto via Getty Images)
Hong Kong Chief Executive Carrie Lam addresses a press conference in Hong Kong on Jan. 25. Announcing a citywide virus emergency, Lam ordered the cancellation of all official trips to mainland China and school shutdown till Feb. 17.
Slide 69 of 94: A police officer stands guard in front of the closed gate of Lama Temple where a notice saying that the temple is closed for the safety concern following the outbreak of a new coronavirus is seen, in Beijing, China January 25, 2020. REUTERS/Carlos Garcia Rawlins
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A police officer stands guard in front of the closed gate of Lama Temple in Beijing on Jan. 25. A notice reads that the temple is closed due to safety concerns following the outbreak of a new coronavirus.
Slide 72 of 94: CHICAGO, ILLINOIS - JANUARY 24: Dr. Allison Arwady, commissioner of the Chicago Department of Public Health, speaks to reporters about a patient in Chicago who has been diagnosed with the Coronavirus on January 24, 2020 in Chicago, Illinois. The patient is the second in the United States to be diagnosed with the illness. (Photo by Scott Olson/Getty Images)
Dr. Allison Arwady, commissioner of the Chicago Department of Public Health, speaks to reporters about a patient who has been diagnosed with coronavirus, in Chicago, Illinois, U.S., on Jan. 24.
Slide 82 of 94: Director-General of World Health Organization (WHO) Tedros Adhanom Ghebreyesus takes part in a news conference after a meeting of the International Health Regulations (IHR) Emergency Committee for Pneumonia due to the Novel Coronavirus 2019-nCoV in Geneva, Switzerland, January 22, 2020. Christopher Black/WHO/Handout via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY
Director-General of World Health Organization (WHO), Tedros Adhanom Ghebreyesus, takes part in a news conference after a meeting of the International Health Regulations (IHR) Emergency Committee to discuss about the outbreak of Pneumonia in China and other countries due to the 2019-nCoV, in Geneva, on Jan. 22.

https://www.msn.com/en-in/health/in-depth/even-without-symptoms-wuhan-coronavirus-may-spread-experts-fear/ar-BBZETzz?ocid=spartanntp#image=BBZeIyF|82

Slide 84 of 94: Two women wearing protective masks walk outside Beijing railway station in Beijing on January 22, 2020. - A new virus that has killed nine people, infected hundreds and reached the United States could mutate and spread, China warned on January 22, as authorities urged people to steer clear of the city at the heart of the outbreak. (Photo by NICOLAS ASFOURI / AFP) (Photo by NICOLAS ASFOURI/AFP via Getty Images)
Two women wearing protective masks walk outside Beijing railway station on Jan. 22.
Slide 85 of 94: Passengers wear masks to prevent an outbreak of a new coronavirus in a subway station, in Hong Kong, Wednesday, Jan. 22, 2020. The first case of coronavirus in Macao was confirmed on Wednesday, according to state broadcaster CCTV. The infected person, a 52-year-old woman, was a traveller from Wuhan. (AP Photo/Kin Cheung)
Passengers wear masks at a subway station in Hong Kong on Jan. 22.
Slide 90 of 94: Health officials watch travelers on a thermographic monitor at the Kuala Lumpur International Airport in Sepang, Malaysia, Tuesday, Jan. 21, 2020.
Health officials watch travelers on a thermographic monitor at the Kuala Lumpur International Airport in Sepang, Malaysia, on Jan. 21.
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