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FILE - In this Sept. 14, 2021, file photo, a health worker administers a dose of a Pfizer COVID-19 vaccine during a vaccination clinic at the Reading Area Community College in Reading, Pa. A key government advisory panel overwhelmingly rejected Biden's plan to give COVID-19 booster shots across the board and instead recommended the extra vaccine dose only for those who are 65 or older or run a high risk of severe disease. (AP Photo/Matt Rourke, File)
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The single booster dose can be administered at least six months after completion of the second dose and applies only to individuals who previously received the Pfizer vaccine.
