Here’s Why Vaccinated People Still Need to Wear a Mask

The new vaccines will probably prevent you from getting sick with Covid. No one knows yet whether they will keep you from spreading the virus to others — but that information is coming.

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Scientists worry that if vaccinated people are silent spreaders of the virus, they may keep it circulating in their communities, putting unvaccinated people at risk. Photo: Max Whittaker for The New York Times

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