HIV patient presented with diarrhea. On stool examination, following acid fast organisms was seen. What is the drug of choice in this patient
**Core Concept**
The patient's presentation with diarrhea and the presence of acid-fast organisms in the stool is suggestive of an intestinal infection caused by Mycobacterium avium complex (MAC) or Cryptosporidium, both of which are opportunistic pathogens in immunocompromised individuals, particularly those with HIV/AIDS. The acid-fast staining properties are characteristic of these organisms.
**Why the Correct Answer is Right**
The drug of choice in this scenario is **azithromycin**. Azithromycin is a macrolide antibiotic that has been shown to be effective against MAC infections in HIV patients. It works by inhibiting protein synthesis in the bacterial cells, thereby preventing the growth and replication of the organism. Azithromycin is often used in combination with other antiretroviral medications to manage MAC infections in HIV patients.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because trimethoprim-sulfamethoxazole (TMP-SMX) is not the first-line treatment for MAC infections. While it may be used to treat other opportunistic infections in HIV patients, such as Pneumocystis jirovecii pneumonia, it is not the preferred choice for MAC infections.
* **Option B:** This option is incorrect because ciprofloxacin is not effective against MAC infections. Ciprofloxacin is a fluoroquinolone antibiotic that is used to treat a variety of bacterial infections, but it is not the preferred choice for treating MAC infections in HIV patients.
* **Option D:** This option is incorrect because rifabutin is not the first-line treatment for MAC infections. While rifabutin is an antimycobacterial medication that may be used to treat MAC infections, it is often used in combination with other medications, including azithromycin, and is not the preferred choice as a monotherapy.
**Clinical Pearl / High-Yield Fact**
In HIV patients, MAC infections can be a significant cause of morbidity and mortality, particularly in those with advanced immunosuppression. Therefore, it is essential to suspect MAC infections in HIV patients presenting with diarrhea and to initiate treatment promptly with azithromycin and other antiretroviral medications.
**Correct Answer:** C. Azithromycin