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Herd immunity appears unlikely for COVID-19, but CDC says vaccinated people can ditch masks in most settings

  • Written by William Petri, Professor of Medicine, University of Virginia
Herd immunity appears unlikely for COVID-19, but CDC says vaccinated people can ditch masks in most settingsA woman walks by a sign in New York City amid the coronavirus pandemic on March 30, 2021.Noam Galai/Getty Images

When COVID-19 first began spreading, public health and medical experts began talking about the need for the U.S. to reach herd immunity to stop the coronavirus from spreading. Experts have estimated that between 60% and 90% of people in...

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