RSV infection

Infections. Also called: Respiratory syncytial virus.

How common is RSV infection in the US?

RSV-associated hospitalizations, preliminary estimate: 190,000-350,000 (Hospitalizations over one season, not a rate; United States, July 2024 to June 2025). Source: MMWR Morbidity and Mortality Weekly Report (CDC), 2026. Label: MODELED.

• 190,000-350,000 RSV-associated hospitalizations, preliminary estimate. Out of: Hospitalizations over one season, not a rate. Where: United States. When: July 2024 to June 2025. Hospital stays only, not all infections. Label: MODELED.

  COVID-19 was associated with an estimated 290,000-450,000 hospitalizations and 34,000-53,000 deaths; RSV was associated with 190,000-350,000 hospitalizations and 10,000-23,000 deaths.

  Source: Respiratory Virus Activity - United States, July 1, 2024-June 30, 2025. MMWR Morbidity and Mortality Weekly Report (CDC), 2026. PubMed 41712508. DOI 10.15585/mmwr.mm7506a2.
• 10,000-23,000 RSV-associated deaths, preliminary estimate. Out of: Deaths over one season, not a rate. Where: United States. When: July 2024 to June 2025. Deaths only. Label: MODELED.

  COVID-19 was associated with an estimated 290,000-450,000 hospitalizations and 34,000-53,000 deaths; RSV was associated with 190,000-350,000 hospitalizations and 10,000-23,000 deaths.

  Source: Respiratory Virus Activity - United States, July 1, 2024-June 30, 2025. MMWR Morbidity and Mortality Weekly Report (CDC), 2026. PubMed 41712508. DOI 10.15585/mmwr.mm7506a2.

Each figure measures something different. Do not compare them with each other or with other conditions.

Medical codes

• ICD-10-CM FY2026: B97.4 Respiratory syncytial virus as the cause of diseases classified elsewhere (related). Used alongside a code for the illness itself.
• ICD-10-CM FY2026: J21.0 Acute bronchiolitis due to respiratory syncytial virus (narrower)

Research activity

As of 2026-09-24: 561 registered studies on ClinicalTrials.gov (search Respiratory Syncytial Virus Infection) and 6,598 PubMed records, 2021 to 2025. A count of records is not how common or serious the condition is.

Population information, not medical advice. Methodology · Known limitations