Multiple Choice
A flu vaccine is needed seasonally to be effective but a polio vaccine is only needed once.The best explanation of this is ________.
A) the flu vaccine is substantially weaker than the polio vaccine
B) exposure to flu vaccine produces no memory cells from proliferating B-lymphocytes
C) the polio virus is substantially weaker than the flu virus
D) the flu has several strains that change seasonally
Correct Answer:
Verified
Correct Answer:
Verified
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