For the brand new examine, CDC researchers checked out RSV hospitalization charges throughout two completely different RSV surveillance networks of hospitals and medical facilities (referred to as RSV-NET and NVSN). They in contrast the networks’ hospitalization charges in the 2024–2025 RSV season to their respective charges in pre-pandemic seasons between 2018 and 2020. The evaluation discovered that amongst newborns (0–2 months), RSV hospitalizations fell 52 % in RSV-NET and 45 % in NVSN in contrast with the charges from the 2018–2020 interval. Nonetheless, when the researcher excluded information from NVSN’s surveillance website in Houston—the place the 2024–2035 RSV season began earlier than the vaccine and treatment have been rolled out—there was a 71 % decline in hospitalizations in NVSN.

For a broader group of infants—0 to 7 months outdated—RSV-NET confirmed a 43 % drop in hospitalizations in the 2024–2025 RSV season, and NVSN noticed a 28 % drop. Once more, when Houston was excluded from the NVSN information, there was a 56 % drop.

Lastly, the researchers checked out hospitalization charges for toddlers and kids up to 5 years outdated, who would not have been protected by the brand new merchandise. There, they noticed RSV hospitalization charges have been really increased in the 2024–2025 season than in the pre-pandemic years. That means that the most recent RSV season was extra extreme, and the drops in toddler hospitalizations could also be underestimates.