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https://www.cdc.gov/flu/fluvaxview/coverage-2021estimates.htm
Flu Vaccination Coverage, United States, 2020–21 Influenza Season
Vaccination coverage with ≥1 dose of flu vaccine was 58.6% among children 6 months through 17 years, a decrease of 5.1 percentage points from the 2019–20 flu season, and flu vaccination coverage among adults ≥18 years was 50.2%, an increase of 1.8 percentage points from the prior season.