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Tomconroy

(7,611 posts)
15. Apparently another part of the problem is that the flu mutates
Tue Aug 31, 2021, 12:20 PM
Aug 2021

Constantly, like Covid, so we need a new flu vaccine every year which is often only going to be partially effective.

https://www.nbcnews.com/health/health-news/flu-shot-fail-why-doesn-t-vaccine-always-work-n21446

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