Most Americans who get their bivalent booster vaccine are not protected against falling sick with Covid, official data suggests.
A report by the Centers for Disease Control and Prevention (CDC) released Wednesday found the updated shots were just 48 percent effective at stopping symptomatic infection caused by the XBB.1.5 subvariant for up to three months.
The CDC highlighted that the main purpose of the vaccines is to prevent hospitalization and death rather than transmission, and they are still expected to give high protection against severe illness.
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