Flu Incubation Period 2025. There has been one change to the advice for adult flu vaccines for 2025 to 2026 recommended by jcvi as the adjuvanted influenza vaccine. The infectious period can start up to 24 hours before the onset of symptoms until 7 days after.

The peak hospital demand due to covid. The cdc estimates at least 24 million illnesses, 310,000 hospitalizations, and 13,000 deaths from the flu since the start of october.