Interim Estimates of 2025-26 Seasonal Influenza Vaccine Effectiveness - California, October 2025-January 2026. - Zhu S; Quint J; León TM; Li NJ; Muldrew S; Porse C; Flannery B; Ellington S; Murray EL; Sachdev D; McCullough K; Schechter R (MMWR. Morbidity and mortality weekly report, 2026)