Upon performing a Kirby-Bauer disc diffusion test using Staphylococcus aureus, you observe no zone of inhibition...
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?
| Staphylococcus aureus is resistant to penicillin and sensitive to vancomycin. |
| Staphylococcus aureus is resistant to both vancomycin and penicillin. |
| Staphylococcus aureus is resistant to penicillin but may or may not be sensitive to vancomycin. |
| Penicillin is bactericidal toward Staphylococcus aureus, and vancomycin is bacteriostatic toward S. aureus. |
Homework Answers
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Zone of inhibition is represented by a circular shaped area around a antibiotic in which bacteria colonies are not present due to inhibition of growth.
No zone of inhibition represent resistance to penicillin. Staphylococcus aureus can freely multiply in the area.
A 15 mm zone of inhibition represent high bacteriocidal effect of vancomycin on Staphylococcus aureus.
So, the correct option is a. Staphylococcus aureus is resistant to penicillin and sensitive to vancomycin.
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