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What are coronaviruses?

Pedestrians wear protective masks as they walk through a shopping district in Tokyo Thursday, Jan. 16, 2020. Japan's government said Thursday a man treated for pneumonia after returning from China has tested positive for the new coronavirus…
What are coronaviruses?
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A new coronavirus virus - from the family as the deadly SARS disease - has spread beyond China's borders, with cases emerging in the U.S., Thailand, Japan, and South Korea. What are coronaviruses, how are they spread and where do they come from? Watch the video above to learn more.