Jan. 11, 2021 — More than half of all COVID-19 cases transmit from people who don’t have any symptoms, according to a model developed by CDC researchers.

About 59% of transmission comes from people without symptoms, according to a new study published Thursday in JAMA Network Open. This includes 35% from people who infect others before they show symptoms and 24% from people who never develop any symptoms.

“The bottom line is controlling the COVID-19 pandemic really is going to require controlling the silent pandemic of transmission from persons without symptoms,” Jay Butler, one of the study authors and the CDC deputy director for infectious diseases, told The Washington Post.

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