
Here's what we know about the effectiveness of vaccines for variants of concerns, notably the Delta variant, first identified in India and now responsible for 20% of new U.S. cases.
(Image credit: Oli Scarff /AFP via Getty Images)

Here's what we know about the effectiveness of vaccines for variants of concerns, notably the Delta variant, first identified in India and now responsible for 20% of new U.S. cases.
(Image credit: Oli Scarff /AFP via Getty Images)
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