Microorganisms and Disease
Both Mycobacterium tuberculosis and Streptococcus pneumoniae

stay in the lung and rarely, if ever, enter the bloodstream
have polysaccharide capsules
have cell walls that contain a high content of mycolic acids
are acquired by inhalation

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Microorganisms and Disease
Prontosil is

an effective antibacterial when used in animals
an effective antibacterial both in animals as well as in in-vitro cultures
an effective antibacterial when used in in-vitro cultures
not used as an antibacterial agent

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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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