Outpatients’ interim estimates of 2025–2026 seasonal influenza vaccine effectiveness in the Community of Madrid (SiVIRA-MAD Group Data)
Background: In June and July 2025, a rapid increase in the incidence of influenza A(H3N2) subclade K raised awareness about a possible vaccine mismatch. We estimated the mid-season influenza vaccine effectiveness (IVE) against laboratory-confirmed influenza in outpatient settings in the Community of Madrid for the 2025/26 season. Methods: Individuals attending to primary care with acute […]