Effectiveness Estimates of 2025 Influenza Vaccines in Preventing Influenza-Associated Outpatient and Hospitalized Illness
(Oct. 10, 2025) – It is seasonal flu vaccination time, and the Centers for Disease Control and Prevention has recently reported on interim effectiveness data of the 2025 influenza vaccines in preventing influenza-associated illness and hospitalization. The interim data, based on the effectiveness of this season's influenza vaccines in the Southern Hemisphere, provides insight into their potential effectiveness in the Northern Hemisphere. During the 2025 Southern Hemisphere influenza season, seasonal influenza vaccination reduced influenza-associated outpatient visits by 50.4 percent and hospitalization by 49.7 percent. For more information, see the
full report in the Sept. 25, 2025,
Morbidity and Mortality Weekly Report.
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Karen Braman