HTV pt with malabsotion, fever, chronic diarrhoea, with acid fast positive organism. What is the causative agent ?
**Core Concept**
The question requires identification of an acid-fast positive organism causing malabsorption, fever, and chronic diarrhea in a patient with HIV (HTV). This organism likely affects the gastrointestinal tract, leading to malabsorption, and is associated with immunocompromised individuals.
**Why the Correct Answer is Right**
The correct answer is likely *Mycobacterium avium complex (MAC)*, a type of nontuberculous mycobacteria (NTM) that is acid-fast positive. MAC infections are common in immunocompromised individuals, particularly those with HIV/AIDS, and can cause disseminated disease, including gastrointestinal involvement. MAC organisms can invade the intestinal mucosa, leading to malabsorption, chronic diarrhea, and fever.
**Why Each Wrong Option is Incorrect**
* **Option A:** *Mycobacterium tuberculosis* is acid-fast positive but typically causes pulmonary disease, not gastrointestinal malabsorption in HIV patients.
* **Option B:** *Cryptosporidium parvum* is a protozoan that causes gastrointestinal disease in immunocompromised individuals but is not acid-fast positive.
* **Option C:** *Mycobacterium leprae* is acid-fast positive but causes leprosy, a chronic infection of the peripheral nerves and skin, not gastrointestinal malabsorption.
**Clinical Pearl / High-Yield Fact**
In HIV patients, MAC infections are often associated with low CD4 counts (<50 cells/μL) and can be treated with a combination of antibiotics, including macrolides and rifamycin.
**Correct Answer:** C. Mycobacterium avium complex (MAC)