What we know about China's deadly coronavirus outbreak -- and what we don't

Chinese officials are racing to respond to a highly contagious pneumonia-like virus that has now killed at least 17 people, infected hundreds more and spread to several other countries. In an effort to contain the illness, the city of Wuhan has issued a partial quarantine and shut down public transportation. But the medical gravity of the virus remains unknown. William Brangham reports.

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