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FILE — Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, speaks during a hearing before the Senate Health, Education, Labor, and Pensions Committee in Washington, July 20, 2021. Wading into an acrimonious debate over booster doses, researchers in Israel reported on Wednesday, Sept. 15, that a third dose of the Pfizer-BioNTech coronavirus vaccine can prevent both infections and severe illness in adults older than 60 for at least 12 days. (Stefani Reynolds/The New York Times)