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
The Institut Pasteur lab in Paris analyzes patient tests for respiratory viruses, including coronaviruses. Thomas Samson/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
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
Local health workers across the U.S. have been reaching out to the Centers for Disease Control and Prevention for guidance on how to screen, manage and treat potential cases of coronavirus. Currently, testing for the virus must take place at the CDC. Kevin C. Cox/Getty Images hide caption
The Centers for Disease Control and Prevention's headquarters in Atlanta. Jessica McGowan/Getty Images hide caption
As more cases continue to be confirmed, health officials and medical works in Wuhan, China, and throughout the country ramp up efforts to contain the spread. Dake Kang/AP hide caption
A man in Wuhan, China, the epicenter of the current coronavirus outbreak, walks by a local mural. Stringer/Getty Images hide caption
A man rides past the Huanan Seafood Wholesale Market in Wuhan, China, which was closed after being linked to cases of a newly discovered coronavirus. Getty Images hide caption
Three U.S. airports will screen passengers from Wuhan, China, for coronavirus symptoms: Los Angeles International Airport (pictured above), JFK in New York and SFO in San Francisco. FG/Bauer-Griffin/GC Images hide caption
An image of HIV from a scanning electron microscope. A vaccine project is in very early stages, but it's sparking interest among scientists in the field. MedicalRF/Science Source hide caption
Health workers in protective suits tend to an Ebola victim kept in an isolation cube in Beni in the Democratic Republic of Congo. Jerome Delay/AP hide caption
