Influenza-Associated Hospitalization Rates by Underlying Conditions, 2016–2017 to 2019–2020: A Retrospective Cohort Study

The burden of baseline medical conditions is associated with higher rates of influenza-associated hospitalization. Among those with varying types and number of UMCs, if vaccination prevalence had been lower than observed, influenza-associated hospitalization rates would have been higher. These findings highlight the importance of preventive medical care and annual influenza vaccination in reducing influenza-associated hospitalizations, particularly for individuals at high risk.