Beth Mole, Ars Technica 5/08/25: New RSV vaccine, treatment linked to dramatic fall in baby hospitalizations
An excerpt:
RSV, or respiratory syncytial (sin-SISH-uhl) virus, is the leading cause of hospitalization for infants in the US. An estimated 58,000–80,000 children younger than 5 years old are hospitalized each year. Newborns—babies between 0 and 2 months—are the most at risk of being hospitalized with RSV…
But the 2024–2025 season was different—there were two new ways to protect against the infection. One is a maternal vaccine, Pfizer’s Abrysvo, which is given to pregnant people when their third trimester aligns with RSV season (generally September through January)…the other new protection against RSV is a long-acting monoclonal antibody treatment, nirsevimab, which is given to babies under 8 months old as they enter or are born into their first RSV season and may not be protected by maternal antibodies.
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)…
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 NVSN.
For a broader group of infants—0 to 7 months old—RSV-NET showed a 43 percent drop in hospitalizations in the 2024–2025 RSV season, and NVSN saw a 28 percent drop.Again, when Houston was excluded from the NVSN data, there was a 56 percent drop.
Lastly, the researchers looked at hospitalization rates for toddlers and children up to 5 years old, who wouldn’t have been protected by the new products. There, they saw RSV hospitalization rates were actually higher in the 2024–2025 season than in the pre-pandemic years.
Related CDC link: Healthcare Providers: RSV Immunization for Infants and Young Children
Related blog posts:
gutsandgrowth 