Preliminary Estimates of Cumulative RSV Hospitalizations by Week

This dataset represents preliminary weekly estimates of cumulative U.S. RSV hospitalizations since the start of the 2024 respiratory season. Estimates are preliminary, and use reported weekly hospitalizations among people with a laboratory-confirmed respiratory syncytial virus (RSV) infection. The data are updated weekly as new RSV hospitalizations are reported to CDC from the RSV-NET surveillance system and include both new admissions that occurred during the reporting week, as well as those admitted in previous weeks that may not have been included in earlier reporting. Each week CDC estimates a range (i.e., a lower estimate and an upper estimate) of RSV hospitalizations that have occurred since the start of respiratory season. For details, please refer to the publications [1, 8]. Note: Data are preliminary and subject to change as updated data become available. Rates for recent RSV hospital admissions are subject to reporting delays; as new data are received each week, previous rates are updated accordingly. Note: Preliminary burden estimates are not inclusive of data from all RSV-NET sites. Due to model limitations, sites with small sample sizes can impact estimates in unpredictable ways and are excluded for the benefit of model stability. CDC is working to address model limitations and include data from all sites in final burden estimates. The methodology used for RSV burden estimation between the surveillance periods was updated to account for inclusion of additional surveillance sites, seasonal changes to adjustment factors, revised outpatient visits and death multiplier ratios, and improvements in estimation methods. References 1. Koumans EHA, Khan D, Trejo I, et al; Estimate of Burden of COVID-19 Workgroup. Estimated burden of COVID-19 illnesses, medical visits, hospitalizations, and deaths in the US from October 2022 to September 2024. JAMA Intern Med. Published online January 5, 2026. [Estimated Burden of COVID-19 Illnesses, Medical Visits, Hospitalizations, and Deaths in the US From October 2022 to September 2024 | Coronavirus (COVID-19) | JAMA Internal Medicine | JAMA Network] 2. Reed C, Chaves SS, Daily Kirley P, et al. Estimating influenza disease burden from population-based surveillance data in the United States. PLoS One. 2015;10(3):e0118369. [Estimating Influenza Disease Burden from Population-Based Surveillance Data in the United States | PLOS One] 3. Rolfes, MA, Foppa, IM, Garg, S, et al. Annual estimates of the burden of seasonal influenza in the United States: A tool for strengthening influenza surveillance and preparedness. Influenza Other Respi Viruses. 2018; 12: 132– 137. [https://doi.org/10.1111/irv.12486] 4. Tokars JI, Rolfes MA, Foppa IM, Reed C. An evaluation and update of methods for estimating the number of influenza cases averted by vaccination in the United States. Vaccine. 2018;36(48):7331-7337. doi:10.1016/j.vaccine.2018.10.026 5. Collier SA, Deng L, Adam EA, Benedict KM, Beshearse EM, Blackstock AJ, Bruce BB, Derado G, Edens C, Fullerton KE, Gargano JW, Geissler AL, Hall AJ, Havelaar AH, Hill VR, Hoekstra RM, Reddy SC, Scallan E, Stokes EK, Yoder JS, Beach MJ. Estimate of Burden and Direct Healthcare Cost of Infectious Waterborne Disease in the United States. Emerg Infect Dis. 2021 Jan;27(1):140-149. doi: 10.3201/eid2701.190676. PMID: 33350905; PMCID: PMC7774540. 6. Reed C, Kim IK, Singleton JA, et al. Estimated influenza illnesses and hospitalizations averted by vaccination–United States, 2013-14 influenza season. MMWR Morb Mortal Wkly Rep. 2014 Dec 12;63(49):1151-4. https://www.cdc.gov/mmwr/preview/mmwrhtml/mm6349a2.htm 7. Reed C, Angulo FJ, Swerdlow DL, et al. Estimates of the Prevalence of Pandemic (H1N1) 20