Wiktionary
microsporidiosis
n. infection by microsporidians
Wikipedia
Microsporidiosis
Microsporidiosis is 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 microbial (unicellular) fungi.
In HIV infected individuals, microsporidiosis generally occurs when CD4+ T cell counts fall below 150.