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flu vaccine strains 2026-2027 — 1 pages

Reference US Flu Season 2026-27 Vaccine Guide — All 3 Strains Updated, Best Timing Sept-Oct For 2026-27, all three US flu vaccine strains were updated, including new H3N2 subclade K coverage. CDC advises everyone 6 months and older get a flu shot, ideally in September or October. Science · Oct 7