https://cdc.gov/flu-vaccines-work/
Flu Vaccines Work | Flu Vaccines Work | CDC
Various factors influence how well flu vaccines work including repeat vaccinations.
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https://apnews.com/article/flu-season-cdc-subclade-k-vaccination-11952f89201d2396ec0c52461441c82b
Flu vaccines didn't work that well. Blame subclade K | AP News
Mar 13, 2026 - As the U.S. flu season winds down, health officials say the flu vaccine didn’t work very well. It had one of its worst effectiveness rates in more than a...
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