BMC Public Health
An outbreak report of Influenza A(H3) among residents of a large nursing home in northern Italy: attack rates, clinical features and outcomes
Abstract Background Nursing homes are high-risk settings for Influenza outbreaks, and the 2025–2026 Influenza season has been characterised by an earlier-than-usual epidemic onset globally with the emergence of a novel Influenza A(H3N2) subclade K strain including mutations that were not present in the strains of the 2025–2026 seasonal vaccine. Detailed outbreak investigations are essential to inform Infection Prevention and Control (IPC) strategies in these high-risk yet often neglected settings. Methods This is a …