Infectious Disease Advisor In the United States, seasonal respiratory viruses such as respiratory syncytial virus (RSV) and SARS-CoV-2 continue to substantially impact younger children and older adults, according to study findings published in Morbidity and Mortality Weekly Report.
Researchers from the Centers for Disease Control and Prevention (CDC) detailed respiratory virus activity between July 2024 and June 2025 using data from 6 sources: the National Respiratory and Enteric Virus Surveillance System, the COVID-19-Associated Hospitalization Surveillance Network, the New Vaccine Surveillance Network, the RSV-Associated Hospitalization Surveillance Network, the National Vital Statistics System, and national data on SARS-CoV-2 genomic surveillance and RSV subtyping.
During the study period, SARS-CoV-2, rhinoviruses/enteroviruses, and parainfluenza viruses types 1-4 showed 2 distinct spikes in activity. In contrast, RSV, influenza, human metapneumovirus, and common coronaviruses peaked once.
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