A spore-forming parasitic protozoan that chiefly affects insects.
- Genus Nosema, phylum Microspora, kingdom Protista: several species, in particular N. apis, which causes infectious dysentery (nosema disease) in honeybees
- A midgut infected with nosema is off white and a little swollen and is less segmented in appearance.
Modern Latin, from Greek nosēma 'disease'.
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