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Most vaccines seem to provide protection for several years. Why is it necessary to get a flu shot each year?

April 26, 2017flu necessary shot vaccines year

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Most vaccines seem to provide protection for several years. Why is it necessary to get a flu shot each year?

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Flu vaccine traditionally contains protection against 3 separate flu strains. For the past 30+ years, at least one of the vaccine viruses was changed, on average, every year. Therefore, annual vaccination is necessary in order to acquire immunity to the new vaccine strain(s) each year.