TayrcahakeCarole TayrcahakeCarole

21-05-2017
Biology

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A flu vaccine is needed seasonally to be effective but a polio vaccine is only needed once. the best explanation of this is ________.

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mona82592 mona82592

21-05-2017

The flu has several strains that change seasonally

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shockgamespvp shockgamespvp

21-05-2017

the flu virus code changes often as polio virus does not change at all.

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