The influenza vaccine is administered each year because Options: A . &nbspNone of these B . &nbspmutations in the viral hemagglutinin may allow the virus to evade the immune response elicited by previous vaccines C . &nbspit is a polysaccharide vaccine that does not confer long-term protection D . &nbspthe vaccine is sufficiently toxic to make it necessary to administer only a small amount at any one time

The influenza vaccine is administered each year because

Question

The influenza vaccine is administered each year because

Options:

A . None of these

B . mutations in the viral hemagglutinin may allow the virus to evade the immune response elicited by previous vaccines

C . it is a polysaccharide vaccine that does not confer long-term protection

D . the vaccine is sufficiently toxic to make it necessary to administer only a small amount at any one time

Answer: Option B

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