Microbiology HIV pt with malabsotion, fever, chronic diarrhoea, with acid fast positive organism. What is the causative agent? A Giardia B Microsporidia C Isospora D E. Histolytica 💡 Explanation HIV pt with malabsotion, fever, chronic diarrhoea, with acid fast positive organism. What is the causative agent? ✓ Correct Answer: C. Isospora