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45 votes
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?.

User Pcarter
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1 Answer

17 votes
17 votes

Answer:

Some drug-resistant bacteria were present at the start of treatment, and natural selection increased their frequency.

Step-by-step explanation:

I hope this helps

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User Pujan
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