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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