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Flu season is near – here’s a guide to available vaccines

<name>Annette Regan, Adjunct Associate Professor of Epidemiology, University of California, Los Angeles</name> <foaf:homepage rdf:resource="https://theconversation.com/profiles/annette-regan-210075"/>· 6 octobre 2026

Several flu vaccine options are available, including a new one that's mRNA-based, the first of its kind. NurPhoto/Getty Images The number of people sick with flu is starting to increase across the United States, with health authorities warning that in some western regions of the country, the 2026-2…

Résumé

Flu season timing

Influenza activity is beginning to rise in the United States, with some western regions experiencing an earlier-than-usual start to the 2026-27 flu season.

While flu cases remain low nationally as of late September, the number of people testing positive for respiratory infections has begun increasing, indicating that flu viruses are spreading more widely.

Typically, flu season in the U.S.

starts in the fall and peaks between December and February.

The timing and severity of each flu season depend on factors such as which flu viruses are circulating, how well they match the vaccine, and the level of immunity in the community.

For example, the 2025-26 flu season was classified as moderately severe, with over 32 million cases, 390,000 hospitalizations, and up to 81,000 deaths, peaking in December.

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