More deadly than influenza, COVID-19 is a coronavirus - part of a large family of viruses that include the common cold as well as more severe diseases such as Middle East Respiratory Syndrome (MERS) and severe acute respiratory syndrome (SARS). Coronaviruses look like a ball surrounded by a crown.
Here's an animated look at how the coronavirus gets into lung cells — and how it might be stopped.
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How to Stop a Killer