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A family of the class Microsporida that includes the genera Encephalitozoon and Nosema, containing several pathogenic and economically important species.
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Nosema Disease--An intestinal disorder of bees caused by the parasite Nosema apis, family Nosematidae.
Protozoosis caused by Vairimorpha necatrix microsporidia Nosematidae in larvae of Spodoptera frugiperda Lepidopera Noctuidae.