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.
Deciduous and permanent teeth. (A) The deciduous teeth, with the age of eruption given in months; (B
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Staphylococcus aureus cells (yellow) stuck in mucus secreted by human nasal epithelial cells.