At least 50% of COVID-19 cases spread from people without symptoms, a new study found

Customers eat lunch at tables outside restaurants in London, England, September 20, 2020.
Daniel Leal-Olivas/AFP via Getty Images
At least 50% of new COVID-19 cases are transmitted by people who don't show symptoms, according to a new study.
That includes people who never display symptoms and those whose symptoms hadn't started yet. 
A study authors said findings underscore the need for people who feel healthy to follow public-health guidance on mask wearing and social distancing.
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