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DeSantis

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It found that 1.9% of the study participants who received the original booster became infected. Among those who got the updated bivalent vaccine -- the one that scientists hoped would work better -- a higher percentage, 3.2%, became infected. Both versions of the shot were found to be safe.

This infection data was far from complete. The number of study subjects who became infected was very small, and both the patients and the researchers were aware of who was getting the original shot and who was getting the new booster.
 
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