US moves toward coronavirus herd immunity

By David Hogberg

Published May 28, 2021 10:45am ET

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US moves toward coronavirus herd immunity — "Our ability to withstand these losses is dependent on our achieving anticipated synergies in the Humana acquisition," Aetna's Mark Bertolini wrote. (AP Photo) | Jessica Hill

Some areas of the United States may be close to reaching herd immunity, even if the country as a whole is still far off.

Herd immunity is achieved when enough of the population is either vaccinated or has natural immunity from infection.

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