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CDC study: COVID booster effectiveness wanes, still strong

Researchers estimated how well Pfizer or Moderna booster shots prevented COVID-related medical visits, including in the omicron surge.

CDC study: COVID booster effectiveness wanes, still strong

Researchers estimated how well Pfizer or Moderna booster shots prevented COVID-related medical visits, including in the omicron surge.

COVID booster shots less effective after 4 months: CDC study

An early look at the performance of COVID-19 booster shots during the recent omicron wave in the U.S. hinted at a decline in effectiveness, though the shots still offered strong protection against severe illness.

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