S. aureus causes a wide variety of infections, ranging from wound infection to pneumonia. Treatment of S. aureus infection with penicillin is often complicated by the
**Core Concept**
The question is testing the student's understanding of the beta-lactamase production by Staphylococcus aureus, which is a major mechanism of resistance to beta-lactam antibiotics like penicillin. This concept is crucial in clinical practice, as it determines the choice of antibiotics for treating S. aureus infections.
**Why the Correct Answer is Right**
Staphylococcus aureus produces the beta-lactamase enzyme, also known as penicillinase, which breaks down the beta-lactam ring of penicillin, rendering it ineffective against the bacteria. This enzyme is encoded by the blaZ gene and is responsible for the resistance of S. aureus to penicillin and other beta-lactam antibiotics. The production of beta-lactamase is a significant mechanism of resistance that complicates the treatment of S. aureus infections with penicillin.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not relevant to the question, and it does not provide a reason why penicillin treatment is complicated by S. aureus infection.
* **Option B:** This option is incorrect because it does not specifically address the mechanism of resistance to penicillin in S. aureus. While it is true that S. aureus can develop resistance to antibiotics, this option does not provide a clear explanation.
* **Option D:** This option is incorrect because it does not accurately describe the mechanism of resistance to penicillin in S. aureus.
**Clinical Pearl / High-Yield Fact**
It is essential for clinicians to be aware of the beta-lactamase production by S. aureus and to choose antibiotics that are effective against this enzyme, such as methicillin-resistant penicillins (MRPs) or cephalosporins. This knowledge is critical in treating S. aureus infections and preventing the development of resistance.
**Correct Answer: C.**