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Adjusted relative vaccine effectiveness for the high-risk subgroup (4–64 years old), post–inverse probability of treatment weighting and Poisson regression. Abbreviations: COPD, chronic obstructive pulmonary disease; ER, emergency room; HIAP, high influenza activity period; IIV4c, cell-derived quadrivalent influenza vaccine; IIV4e, standard egg-derived quadrivalent influenza vaccine; rVE, relative vaccine effectiveness; UTI, urinary tract infection.
