In this Jan. 15, 2021, file photo, Dr. Yomaris Pena, internal medicine physician with Somos Community Care, extracts the Pfizer COVID-19 vaccine out of a vial at a vaccination site at the Corsi Houses in the East Harlem neighborhood of New York. U.S. health regulators have authorized extra doses of the COVID-19 vaccines in people with weakened immune systems to better protect them from the virus. (AP Photo/Mary Altaffer, File)
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