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The flu vaccine is a bit of guesswork since, as I understand it, they have to pick a strain or family of the virus to vaccinate against, based on which they thi
by thrownaway2424 12y ago
The flu vaccine is a bit of guesswork since, as I understand it, they have to pick a strain or family of the virus to vaccinate against, based on which they think is likely to be popular that season. They can be wrong.