Within six months of effectively using methicillin to treat S. aureus infections in a community, all new $S$. aureus infections were caused by a resistant strain (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 drugresistant 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.
Added by Nicholas W.
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This option is possible, but it doesn't explain why all new infections are caused by MRSA. There could still be non-resistant strains in the community. (B) In response to the drug, $S.$ aureus began making drug-resistant versions of the protein targeted by the Show more…
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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 drugresistant 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.
Adi S.
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? \begin{equation}\begin{array}{l}{\text { (A) A patient must have become infected with MRSA from }} \\ {\text { another community. }} \\ {\text { (B) In response to the drug, S. aureus began making drug- }} \\ {\text { resistant versions of the protein targeted by the drug. }} \\ {\text { (C) Some drug-resistant bacteria were present at the start }} \\ {\text { of treatment, and natural selection increased their }} \\ {\text { frequency. }} \\ {\text { (D) } S \text { . aureus evolved to resist vaccines. }}\end{array} \end{equation}
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