Cases of the new coronavirus hint at the disease’s severity, symptoms and spread

Most cases are mild but older patients with health problems can face severe complications

electron micrograph of the new coronavirus, nCov-2019

An infected cell can produce thousands of infectious virus particles (black dots) that are then released from the cell surface, as shown in this electron micrograph of the new coronavirus, nCov-2019. 

John Nicholls, Leo Poon and Malik Peiris/The University of Hong Kong

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