When Is Flu Season 2024 Usa.  — while it typically takes two weeks after vaccination to build strong immunity, the flu season can last until spring. When is the best time to get a.

 — several companies, including gsk, sanofi and csl seqirus are beginning to ship influenza vaccine for the upcoming season 2024/25 flu season.  — flu season in the united states typically stretches from october to february, though activity can last as late as may, according to the cdc.