How repeatedly should the flu vaccine be administered?

is it yearly ,half once a year pliz help

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Answers:    It's giving once a year which is perfect. There isn't any aim to give it more then that. Most of the time you just get the flu during the winter and that is when they make available the shot.

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every year influenza viruses are changing, (shift and drift) somthing something like its genetics, so every year a new vaccine are made and admistered, beforehand the winer season by a couple of months to get its effect as soon as winter come,
i think kids below 5 years own to get two doses to be effective, i reckon i month apart
search for guidelines for more information

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THey give them every year. NEVER as it still contains Mercury.

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