Within Six Months of Effectively Using Methicillin to Treat S

question 2

Multiple Choice

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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