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getting the flu shot then getting the flu is typically due to the strains. Each year the different strains of the influenza virus are passed around. typically those developing the flu vaccine have an educated guess at which strains will be most prevalent the following year, but cannot ever be certain. Usually if you've got a flu vaccine and get the flu, its due to a strain that was not in the falls flu vaccine. I don't know if soremouth is the same, but it sounds like that could be the case.
