Microorganisms and Disease
Plastic implants can pose a serious nosocomial infection problem because

All of these
infected implants usually have to be surgically removed
phagocytes have trouble moving on the plastic surface
phagocytes have trouble engulfing bacteria embedded in a biofilm

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Microorganisms and Disease
The influenza vaccine is administered each year because

None of these
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

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