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Influenza Vaccines
Influenza vaccination at a national level in the US began in 1957, according to a review article by Anthony Fauci and two NIAID Associates 1) published in 2022.
Flu Vaccine History
Flu vaccine shortages in 2004 https://www.webmd.com/cold-and-flu/news/20041005/us-loses-half-its-flu-vaccine-supply