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Originally Posted by deano_hoosier
Interesting point earlier on the news..the first two vaccines were tested when we had fewer variants floating through the population. Now with the greater number of variants the speculation is that the efficacy of the first two vaccines may not have tested out as high. Seems plausible.
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My understanding is that the reason they offer a "regular" flu vaccine each fall is because of this mutation as well. They develop the next fall vaccine to combat as many strains as possible and each year update to fight against each new strain.
Those little buggers are persistent!!