In the United States, respiratory syncytial virus (RSV) infections cause an estimated 58,000–80,000 hospitalizations among children aged <5 years ( 1 , 2 ) and 60,000–160,000 hospitalizations among adults aged ≥65 years each year ( 3 – 5 ). U.S. RSV epidemics typically follow seasonal patterns, peaking in December or January ( 6 , 7 ), but the COVID-19 pandemic disrupted RSV seasonality during 2020–2022 ( 8 ). To describe U.S. RSV seasonality during prepandemic and pandemic periods, polymerase chain reaction (PCR) test results reported to the National Respiratory and Enteric Virus Surveillance System (NREVSS)* during July 2017–February 2023 [...]
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