Influenza vaccine acceptance and hesitancy among adults hospitalized with severe acute respiratory illnesses, United States 2019-2020.

Introduction: Understanding patient factors associated with not being vaccinated is essential for successful implementation of influenza vaccination programs.

Methods: We enrolled adults hospitalized with severe acute respiratory illness at 10 United States (US) hospitals during the 2019-2020 influenza season. We interviewed patients to collect data about influenza vaccination, sociodemographic characteristics, and vaccine perceptions.