Microorganisms and Disease
All infections do not cause fever and all fevers are not due to infections which of the following is an example of non-infections cause of fever?

Malaria
Typhoid
Chicken pox
Rheumatic disease

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Microorganisms and Disease
The influenza vaccine is administered each year because

None of these
the vaccine is sufficiently toxic to make it necessary to administer only a small amount at any one time
it is a polysaccharide vaccine that does not confer long-term protection
mutations in the viral hemagglutinin may allow the virus to evade the immune response elicited by previous vaccines

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