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
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
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