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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 ________.

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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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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User Amit Vaghela
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7.4k points

2 Answers

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

answered
User Thesublimeobject
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8.2k points
6 votes
The flu has several strains that change seasonally
answered
User Alexrnov
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8.3k points
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