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A woman receives a COVID-19 vaccine injection by a pharmacist at a clinic in Lawrence, Mass., on Wednesday, Dec. 29, 2021. One of the first studies to look at the performance of COVID-19 booster shots during the recent omicron wave of illnesses found a surprising decline in effectiveness after only four months. The findings are based on data from hospitals and urgent care centers in 10 states. (AP Photo/Charles Krupa, File)

A woman receives a COVID-19 vaccine injection by a pharmacist at a clinic in Lawrence, Mass., on Wednesday, Dec. 29, 2021. One of the first studies to look at the performance of COVID-19 booster shots during the recent omicron wave of illnesses found a surprising decline in effectiveness after only four months. The findings are based on data from hospitals and urgent care centers in 10 states. (AP Photo/Charles Krupa, File)

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