Vaccines bring the US closer to herd immunity, but more contagious variants make the goal harder to reach.
Kristine Ko, right, waits in line for her vaccine in Los Angeles on April 8, 2021.
Al Seib/Los Angeles Times/Getty Images
The US could reach herd immunity in a matter of weeks or months, but ...
https://www.businessinsider.com/when-will-us-reach-herd-immunity-coronavirus-vaccines-2021-5#BusinessInsider
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