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Vaccine effectiveness against outpatient influenza A(H3N2)-associated illness by time since vaccination, 4 October 2021–30 April 2022, United States. Adjusted for study site, age, month of illness onset, race/ethnicity, and self-rated general health status and included all participants aged ≥6 mo. Abbreviations: CI, confidence interval; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2; VE, vaccine effectiveness.
