Microorganisms and Disease
Pseudomembraneous colitis is

precipitated by the use of certain antibiotics
All of these
caused by a spore-forming bacterium
caused by a gram-positive bacterium

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Microorganisms and Disease
The influenza vaccine is administered each year because

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

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