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2. Centers for Disease Control and Prevention. Vaccine Effectiveness: How Well Do Flu Vaccines Work?; 2023. https://www.cdc.gov/flu/vaccines-work/vaccineeffect.htm.
3. Centers for Disease Control and Prevention. Flu Vaccination Coverage, United States, 2021–22 Influenza Season; 2022. https://www.cdc.gov/flu/fluvaxview/coverage-2022estimates.htm.
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