Police officers wear face masks Wednesday in front of a hotel on Tenerife, the largest of Spain's Canary Islands. Spanish officials say a hotel on the island has been placed under quarantine after an Italian doctor staying there tested positive for the new coronavirus. AP hide caption
People suspected of being infected with the new coronavirus wait for diagnostic tests at a medical center in Daegu, South Korea. Lee Moo-ryul/AP hide caption
A bus departs from the dock where the Diamond Princess cruise ship sits under quarantine with its thousands of passengers and crew. Japanese authorities said Friday that some older passengers who tested negative for the coronavirus were allowed to disembark. Charly Triballeau/AFP via Getty Images hide caption
A horseshoe bat. Bats are known to carry many different strains of viruses but do not get sick from them. Menahem Kahana/AFP via Getty Images hide caption
Flowers and a portrait of Dr. Li Wenliang is left at his hospital in Wuhan, China. Li, regarded a whistleblower in the coronavirus outbreak, died of the infectious disease on Friday. Getty Images hide caption
Millions of Beijing residents are expected to return to the capital city after going away for the Lunar New Year. Above: A traveler at Beijing's West Railway Station on Sunday. Betsy Joles for NPR hide caption
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