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the claim

A person needs to get the flu shot every year to maintain protection against the flu.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
5 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that a person needs to get the flu shot every year to maintain protection against the flu?

Yes. Evidence consistently shows that influenza vaccine effectiveness wanes over time and circulating strains evolve rapidly, requiring annual vaccination to maintain adequate protection.

Verdict: SUPPORTED · 5 sources for, 0 against · Last checked

The analysis

The retrieved literature clearly demonstrates that immunity from influenza vaccines wanes over the course of months and that influenza viruses undergo rapid antigenic drift, necessitating annual updates and repeat vaccinations (as reflected in papers 0, 2, 4, 10, and 11). There is no evidence refuting the necessity of annual vaccination for sustained protection.

Evidence for · 5
Intraseason Waning of Influenza Vaccine Protection: Evidence From the US Influenza Vaccine Effectiveness Network, 2011–2012 Through 2014–2015
2017
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Ferdinands, J. M., Fry, A. M., Reynolds, S., Petrie, J. G., Flannery, B., Jackson, M. L., & Belongia, E. A. (2017). Intraseason Waning of Influenza Vaccine Protection: Evidence From the US Influenza Vaccine Effectiveness Network, 2011–2012 Through 2014–2015. doi.org. https://doi.org/10.1093/cid/ciw816

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More for · 4
Waning immunity and the future of booster vaccination strategies in global vaccine programs post COVID-19.
2026
Get citation
R, B., A, R., T, K., S, B., S, G., S, R., & A, A. (2026). Waning immunity and the future of booster vaccination strategies in global vaccine programs post COVID-19.. doi.org. https://doi.org/10.1080/21645515.2026.2626088

Intraseasonal waning of influenza vaccine effectiveness and implications for the optimal timing of seasonal vaccination programs: A scoping review.
2026
Get citation
P, D., F, T., A, G., C, L., MM, U., N, S., W, S., & A, S. (2026). Intraseasonal waning of influenza vaccine effectiveness and implications for the optimal timing of seasonal vaccination programs: A scoping review.. doi.org. https://doi.org/10.14745/ccdr.v52i06a03

Epitope analysis for influenza vaccine design
2004
Get citation
Munoz, E. T. & Deem, M. W. (2004). Epitope analysis for influenza vaccine design. arxiv.org. https://doi.org/10.48550/arXiv.0408016

Prediction of Influenza B Vaccine Effectiveness from Sequence Data
2016
Get citation
Pan, Y. & Deem, M. W. (2016). Prediction of Influenza B Vaccine Effectiveness from Sequence Data. arxiv.org. https://doi.org/10.1016/j.vaccine.2016.07.015

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