Incidence and etiology of fever following seasonal influenza vaccination in hospitalized patients.

We conducted a retrospective cohort to examine the incidence and etiology of fever postinfluenza vaccination among hospitalized patients during the 2015-2016 influenza season. Fever occurred in 63 (1.5%) of 4,185 vaccinated patients. Medical patients had fever predominantly associated with concurrent infections; surgical patients had fever explained by noninfectious etiologies.