Upon performing a Kirby-Bauer disc diffusion test using Staphylococcus aureus, you observe no zone of inhibition with penicillin and a 15mm zone of inhibition with vancomycin. Based on these observation, which of the following conclusions is valid? Penicillin is bactericidal toward Staphylococcus aureus, and vancomycin is bacteriostatic toward S. aureus. Staphylococcus aureus is resistant to both vancomycin and penicillin. Staphylococcus aureus is resistant to penicillin and sensitive to vancomycin. Staphylococcus aureus is resistant to penicillin but may or may not be sensitive to vancomycin.
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