Interim Effectiveness Estimates of 2025 Southern Hemisphere Influenza Vaccines in Preventing Influenza-Associated Outpatient and Hospitalized Illness -- Eight Southern Hemisphere Countries, March--September 2025. - Russ, Savanah; Nogareda, Francisco; Regan, Annette K.; Benedetti, Estefanía; Pasinovich, Marina; Voto, Carla; Chilver, Monique; Stocks, Nigel; Sullivan, Sheena G.; Cheng, Allen C.; Blyth, Christopher C.; Hassall, Jenna; et al. (MMWR: Morbidity & Mortality Weekly Report, 2025)