An order of the protozoan class Microsporea and phylum Microspora, characterized by minute spores with a single long, coiled, tubular filament enclosing the infective cell or sporoplasm. They are typically parasites of invertebrates and lower vertebrates, although fish and higher vertebrates (including humans) have been infected. The order includes genera such as Encephalitozoon and Nosema.
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Examples: glitazone, GI cocktail, etc.