<prompt> A patient with HIV has diarrhoea with AFB ve organism in stool. The most likely organism is ?Mycobacterium avium intracellulareMycobacterium TBMycobacterium lepraeMycoplasma  <response>: Ans. is a i.e., Mycobacterium avium intracellulare . MAC infection is a late complication of HIV infection, occurs when CD4 50ml, in contrast to T.B. which occurs early even with CD4300m1 . Clinical features - Disseminated disease with fever, weight loss and night sweats most common - Abdominal pain - Diarrhoea - Lymphadenopathy . Diagnosis is made by demonstration of AFB positive mycobacteria in sputum, stool, blood or bone narrow. 