<prompt> HIV pt with malabsotion, fever, chronic diarrhoea, with acid fast positive organism. What is the causative agent ?GiardiaMicrosporidiaIsosporaE. histolytica  <response>: Ans. is c i.e., Isospora Protozoa commonly causing diarrhea in HIV patients and have acid fast oocyst are cryptosporidia and isospora belli. 