A fungal infection caused by Microsporidia. It occurs in immunocompromised patients, causing diarrhea and wasting. The disease is Monarch Disease Ontology term MONDO_0005846 (microsporidiosis). Also known as: Microsporidia caused disease or disorder, Microsporidia disease or disorder, Microsporidia infection, Microsporidia infectious disease, infection by Microspora, infection by Microsporea, infection by Microsporida.