What we know — and don’t know — about a new virus causing pneumonia in China

There’s little evidence so far of person-to-person transmission, but experts urge vigilance

MERS virus

A previously unknown coronavirus is behind an outbreak of respiratory illness in China. So far, there’s little indication the pathogen will spread like a similar virus responsible for MERS (stained yellow in this scanning electron micrograph).

NIAID/Flickr (CC BY 2.0)

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