Flu 2025 Vis. Week ending november 18, 2023. This season's influenza vaccines have been 42% effective so far, according to a new interim estimate from the centers for disease control and prevention,.

2025 to 2025 flu programme summary. On september 20, 2025, the food and drug administration (fda) approved the nasal spray flu vaccine, flumist, for self or caregiver administration.