Undetected cases, many of which were likely not severely symptomatic, were largely responsible for the rapid spread of the COVID-19 outbreak in China, according to new research by scientists at Columbia University’s Mailman School of Public Health. The findings, based on a computer model of the outbreak, are published online in medRxiv, a preprint server for health sciences. (Read a Q&A with study co-author Jeffrey Shaman below.)
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