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Microbiology - Microorganisms and Disease - Discussion

Discussion Forum : Microorganisms and Disease - Section 1 (Q.No. 24)
Microorganisms and Disease
24.
The influenza vaccine is administered each year because
mutations in the viral hemagglutinin may allow the virus to evade the immune response elicited by previous vaccines
it is a polysaccharide vaccine that does not confer long-term protection
the vaccine is sufficiently toxic to make it necessary to administer only a small amount at any one time
none of the above
Answer: Option
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