Washington, DC - The Influenza Hospitalization Surveillance Network (FluSurv-NET) conducts population-based surveillance for laboratory-confirmed influenza-related hospitalizations in select counties in the Emerging Infections Program (EIP) states and Influenza Hospitalization Surveillance Project (IHSP) states.

A total of 2,667 laboratory-confirmed influenza-associated hospitalizations were reported by FluSurv-NET sites between October 1, 2019 and December 28, 2019. The overall hospitalization rate was 9.2 per 100,000 population. The highest rate of hospitalization was among adults aged ≥65 (19.9 per 100,000 population), followed by children aged 0-4 (17.8 per 100,000 population) and adults aged 50-64 (10.0 per 100,000 population). Among 2,667 hospitalizations, 1,374 (51.5%) were associated with influenza A virus, 1,274 (47.8%) with influenza B virus, 10 (0.4%) with influenza A virus and influenza B virus co-infection, and 9 (0.3%) with influenza virus for which the type was not determined. Among those with influenza A subtype information, 259 (80.7%) were A(H1N1)pdm09 and 62 (19.3%) were A(H3N2) viruses.