Common name for members of the protozoan phylum Microspora. It includes some 80 genera parasitizing all classes of vertebrates and many invertebrates, especially the insects. Several genera, such as Encephalitozoon, Enterocytozoon, Nosema, Vittaforma, Pleistophora, and Trachipleistophora have been implicated in the infection of immunocompromised humans.
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Examples: glitazone, GI cocktail, etc.