Flu Vaccine Only 36 Percent Effective This Year
The U.S. Centers for Disease Control and Prevention (CDC) reported that the 2025–2026 influenza vaccine showed reduced effectiveness compared to previous seasons. Researchers linked the lower performance to the emergence of a new influenza A(H3N2) subclade that differed from the strain used to manufacture the vaccine.1 The CDC reported overall flu shot effectiveness at 36 […]