• A man is given a COVID-19 vaccine booster shot in the Bronx, New York, last month. The efficacy of third doses of the Pfizer and Moderna mRNA COVID-19 vaccines wanes substantially by the fourth month after administration, a new study by the U.S. Centers of Disease Control and Prevention said Friday. | JAMES ESTRIN/THE NEW YORK TIMES
    A man is given a COVID-19 vaccine booster shot in the Bronx, New York, last month. The efficacy of third doses of the Pfizer and Moderna mRNA COVID-19 vaccines wanes substantially by the fourth month after administration, a new study by the U.S. Centers of Disease Control and Prevention said Friday. | JAMES ESTRIN/THE NEW YORK TIMES

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WASHINGTON – The efficacy of third doses of the Pfizer and Moderna mRNA COVID-19 vaccines wanes substantially by the fourth month after administration, a new study by the U.S. Centers of Disease Control and Prevention said Friday.

Though it’s now well documented that vaccine efficacy goes down after two doses, relatively little has been published on the duration of protection after a booster.

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