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Originally Posted by xepherys
Well, highthief, there's where it doesn't add up. The pharma companies that manufacture the vaccines make a vaccine for the national supply. However flu variants are dissimilar across the US each year. A flu vaccine may contain virus parts for up to three flu variants, but it's still a guessing game. Even if they guess correctly for part of the country, it's unlikely that they guess right everywhere.
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I cannot speak to the US situation beyond the statistics that offices like the CDC give out concerning the efficacy of the flu vaccine, which consistently suggest success rates of in and around 70% (except in "freak" years like this one, where success of the vaccine is notably lower).