This years flu vaccine had extremely low effectiveness: Interim Estimates of 2025–26 Seasonal Influenza Vaccine Effectiveness — United States, September 2025–February 2026 | MMW
“Interim 2025–26 seasonal influenza VE estimates were derived from three U.S. VE networks. Among children and adolescents, VE was 38%–41% against influenza-associated outpatient visits and 41% against influenza-associated hospitalization. Among adults aged ≥18 years, VE was 22%–34% against influenza-associated outpatient visits and 30% against influenza-associated hospitalization.”
The season peaked about January 1.
