Booster Effectiveness Wanes After 4 Months, Study Shows

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Booster Effectiveness Wanes After 4 Months, Study Shows
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Booster shots of the Pfizer and Moderna COVID-19 vaccines lost some effectiveness after four months but did a good job of keeping people out of the hospital during the Omicron surge.

Booster shots of the Pfizer/BioNTech and Moderna COVID-19 vaccines lost some effectiveness after four months but still did a good job of keeping people out of the hospital during the Omicron surge, a study shows.

The study was no surprise because previous research showed vaccine and booster effectiveness wanes over time, but it appears the booster effectiveness against the Delta variant was stronger than against Omicron, the CDC said. The highly transmissible Omicron variant now accounts for almost 100% of COVID cases in the United States.

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