For the new study, CDC researchers looked at RSV hospitalization rates across two different RSV surveillance networks of hospitals and medical centers (called RSV-NET and NVSN). They compared the networks’ hospitalization rates in the 2024–2025 RSV season to their respective rates in pre-pandemic seasons between 2018 and 2020. The analysis found that among newborns (0–2 months), RSV hospitalizations fell 52 percent in RSV-NET and 45 percent in NVSN compared with the rates from the 2018–2020 period. However, when the researcher excluded data from NVSN’s surveillance site in Houston—where the 2024–2035 RSV season started before the vaccine and treatment were rolled out—there was a 71 percent decline in hospitalizations in
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