It's still very early in the flu season, but the Centers for Disease Control and Prevention says that most cases this year are caused by a mutated H3N2 strain, which the flu vaccine can't really protect against.
Flu vaccines are formulated several months before the season begins, and always target three or four strains. Strains "drift," or mutate, all the time, and although the vaccine can't do much to prevent infection with a drifted virus, there is a bit of cross protection.
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