People who didn’t know they had COVID-19 drove its spread in China

A new simulation shows why rapidly expanding social distancing measures are crucial 

Pedestrians in Wuhan

Pedestrians stroll along a street lined with shops in Wuhan, China, on January 22, before government officials implemented measures to combat the spread of the coronavirus. In this early stage, the outbreak was driven by undetected cases, researchers report.

AP Photo/Dake Kang

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