Author Question: Within six months of effectively using methicillin to treat S. aureus infections (Read 1998 times)

hummingbird

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Within six months of effectively using methicillin to treat S. aureus infections in a community, all new infections were caused by MRSA. How can this result best be explained?
A) S. aureus can resist vaccines.
B) A patient must have become infected with MRSA from another community.
C) In response to the drug, S. aureus began making drug-resistant versions of the protein targeted by the drug.
D) Some drug-resistant bacteria were present at the start of treatment, and natural selection increased their frequency.
E) The drug caused the S. aureus DNA to change.



camila

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Hello

D is the answer for sure ;)



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hummingbird

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Thank you Thank you Thank you :D




 

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