Travelers wearing face masks walk along a concourse at Beijing Capital International Airport on Thursday. American schools are advising students to avoid travel to China, and some are working to evacuate students already there. China reported nearly 11,800 confirmed coronavirus cases on Friday. Mark Schiefelbein/AP hide caption
A chartered jet carrying U.S. citizens being evacuated from Wuhan, China, landed at March Air Reserve Base in Riverside County, Calif., on Wednesday. The passengers are now under a quarantine, the CDC announced Friday. Ringo H.W. Chiu/AP hide caption
There are now nearly 10,000 cases of coronavirus — far more than the reported number of SARS cases worldwide during a 2003 outbreak. Mark Lennihan/AP hide caption
Shellfish for sale in the Tai Po market in Hong Kong on January 29. Many customers come to this market to buy live seafood. Jason Beaubien/NPR hide caption
Passengers in a subway station in Hong Kong on Wednesday wear masks amid the coronavirus outbreak. Kin Cheung/AP hide caption
A worker in a protective suit uses a large fogger to disinfect outdoor areas in a village in Qingdao, Shandong province, as the deadly new coronavirus continues to spread in China. Reuters hide caption
The Institut Pasteur lab in Paris analyzes patient tests for respiratory viruses, including coronaviruses. Thomas Samson/AFP via Getty Images hide caption
Making sure to frequently give your hands a thorough scrub — with soap and for about as long as it takes to sing the "Happy Birthday" song a couple of times — can significantly cut your chances of catching the flu or other respiratory virus. Mandel Ngan/AFP via Getty Images hide caption
A surgical mask and an N95 respirator. Officials in China are urging citizens to wear masks in public to stop the spread of the coronavirus. But can a mask really keep you from catching the virus? Science Photo Library/ Getty Images; South China Morning Post/Getty Images hide caption
Hermione Dickey, 8, and her mother, Priscilla, head to the Wuhan Tianhe International Airport. They were among the passengers on a U.S. evacuation flight out of Wuhan, China. Priscilla Dickey via AP hide caption
Villagers just outside the city of Nanchang, Jiangxi, erected their own blockade with a sign that says, "Outside people and cars forbidden from entering." Residents say hundreds of migrant workers returned from Wuhan for the Lunar New Year holiday and are now not allowed to leave. Amy Cheng/NPR hide caption
As the death toll from the new coronavirus tops 100, hospitals in Wuhan, China, are attending to many patients with confirmed or suspected cases of the illness. Public health officials are working to prevent further spread of the outbreak in China and globally. Xiong Qi/AP hide caption
Health and Human Services Secretary Alex Azar led a press briefing Tuesday laying out the agency's strategy for preventing the novel form of coronavirus from taking hold in the U.S. Alex Brandon/AP hide caption