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Negative control analysis comparing the effect of vaccination with cell-based quadrivalent inactivated influenza vaccine (IIV4c) versus egg-based quadrivalent inactivated influenza vaccine (IIV4e) on the incidence of hospitalizations for injury or trauma in each cohort between 30 September 2019 and 7 March 2020, after adjustment. Abbreviations: CI, confidence interval; rVE, relative vaccine effectiveness.
