Which agent is used in disk diffusion testing to detect methicillin resistance in Staphylococcus aureus?
1Oxacillin only
2Vancomycin
3Penicillin
4Cefoxitin✓ 정답
해설
The cefoxitin disk induces expression of the resistance gene more reliably, which makes interpretation more stable, so it is the standard surrogate for detecting methicillin resistance. Vancomycin is not used to detect this resistance, and penicillin tests a different mechanism.