Within six months of effectively using methicillin to treat s. aureus infections in a community, all new s. aureus infections were caused by mrsa. how can this best be explained?
a. a patient must have become infected with mrsa from another community.
b. in response to the drug, s. aureus began making drug-resistant versions of the protein targeted by the drug.
c. some drug-resistant bacteria were present at the start of treatment, and natural selection increased their frequency.
d. s. aureus evolved to resist vaccines.
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Within six months of effectively using methicillin to treat s. aureus infections in a community, all...
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