Microorganisms and Disease
Lactoferrin helps to protect against pathogens by

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

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

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