Microspridiosis's an opportunistic intestinal infection that causes diarrhea and wasting in immunocompromised individuals (HIV, for example). It results from different species of microsporidia, a group of protozoal parasites. In HIV infected individuals, microsporidiosis generally occurs when CD4+ T cell counts fall below 100. Classification Although it's classified as a protozoal disease in ICD-10, there's been recent evidence that the causative agent's more fungal than protozoal, and some sou… (More on Microsporidiosis)