A flu vaccine is needed seasonally to be effective, but a polio vaccine is only needed once. The best explanation of this is __________.

Question

Accepted Answer

the flu virus mutates, resulting in several strains that change seasonally

Answer

the polio virus is substantially weaker than the flu virus

Answer

the flu vaccine is substantially weaker than the polio vaccine

Answer

exposure to flu vaccine produces no memory cells from proliferating B-lymphocytes

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