Article Correctness Is Author's Responsibility: ‘Stealth Transmission’ Fuels Fast Spread of COVID-19 Outbreak

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This shows a woman in a face maskUndetected and undocumented cases of COVID-19 were largely responsible for the rapid spread of the virus in China. 86% of all infections were undocumented before the January 23 Wuhan travel shutdown. Per person, the undocumented infections were half as contagious as documented infections but were the source of two-thirds of documented infections.