Pfizer authorizes booster dose for 16, 17-year-olds
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• December 14, 2021
FDA approves Pfizer’s COVID-19 vaccine
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Vaccine distributions advance in the U.S., California receives 5.7 million doses
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• January 15, 2021
How the Pfizer vaccine works: A breakdown
by Sabrina Zhu and Mark Hu
• January 6, 2021
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