Microorganisms and Disease
Lactoferrin helps to protect against pathogens by

lowering the pH
facilitating the growth of normal flora
blocking sebum production
sequestering Iron

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Microorganisms and Disease
The influenza vaccine is administered each year because

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
None of these
mutations in the viral hemagglutinin may allow the virus to evade the immune response elicited by previous vaccines

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