Which one of the following drugs is not used in the treatment of mycobacterium avium intercellular infection cla
**Core Concept**
Mycobacterium avium complex (MAC) infection is a type of nontuberculous mycobacterial (NTM) infection that primarily affects individuals with HIV/AIDS. The treatment of MAC infection involves a combination of antibiotics that target the bacterial cell wall and intracellular replication.
**Why the Correct Answer is Right**
The correct answer is a drug that is not typically used in the treatment of MAC infection. MAC infection requires a combination of drugs that can penetrate into macrophages and target the intracellular bacteria. The standard treatment regimen includes macrolides (e.g., clarithromycin), rifamycins (e.g., rifabutin), and ethambutol. The correct answer is a drug that does not have a established role in the treatment of MAC infection.
**Why Each Wrong Option is Incorrect**
* **Option A:** Clarithromycin is a macrolide antibiotic that is commonly used in the treatment of MAC infection. It has good activity against MAC and is often used in combination with other antibiotics.
* **Option B:** Rifabutin is a rifamycin antibiotic that is used in the treatment of MAC infection. It has good activity against MAC and is often used in combination with other antibiotics.
* **Option D:** Ethambutol is a bacteriostatic antibiotic that is used in the treatment of MAC infection. It has good activity against MAC and is often used in combination with other antibiotics.
**Clinical Pearl / High-Yield Fact**
The treatment of MAC infection requires a combination of antibiotics that can target the intracellular bacteria and penetrate into macrophages. Clarithromycin, rifabutin, and ethambutol are commonly used in combination to treat MAC infection.
**Correct Answer:** D.