Active surveillance for laboratory-confirmed influenza hospitalizations is conducted among residents of the seven county Rochester catchment area. A case is defined as a resident in the catchment area having a hospital admission with a laboratory confirmed influenza infection. FluSurv-Net data is used to generate national estimates of the total numbers of flu cases, medical visits, and hospitalizations.
Comprehensive and aggregate data analyses for this project are ongoing and available at the following websites:
The incidence of influenza hospitalizations varies by season and by age group and depends on the circulating influenza strains and the influenza vaccine efficacy.
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O’Halloran AC, Holstein R, Cummings C, Bennett NM, et al. Rates of Influenza-Associated Hospitalization, Intensive Care Unit Admission, and In-Hospital Death by Race and Ethnicity in the United States From 2009 to 2019. JAMA Netw Open. 2021;4(8):e2121880. doi:10.1001/jamanetworkopen.2021.21880
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Chow EJ, Rolfes MA, O'Halloran A, Anderson EJ, Bennett NM, Billing L, Chai S, Dufort E, Herlihy R, Kim S, Lynfield R, McMullen C, Monroe ML, Schaffner W, Spencer M, Talbot HK, Thomas A, Yousey-Hindes K, Reed C, Garg S.; Acute Cardiovascular Events Associated With Influenza in Hospitalized Adults: A Cross-sectional Study. Ann Intern Med. 25 August 2020. Online ahead of print. doi:10.7326/M20-1509. PMID: 32833488.
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Sloan C, Chandrasekhar R, Mitchel E, Ndi D, Miller L, Thomas A, Bennett NM, Chai S, Spencer M, Eckel S, Spina N, Monroe M, Anderson EJ, Lynfield R, et al. Spatial and Temporal Clustering of Patients Hospitalized with Laboratory-Confirmed Influenza in the United States. Epidemics. 2020 June; 31, doi.org/10.1016/j.epidem.2020.100387.
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