Enterocytozoon salmonis N. Sp. An Intranuclear Microsporidium from Salmonid Fish


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The developmental stages of a recently described microsporidian from the nucleus of hematopoietic cells of salmonid fish were found to be unique among the Microsporida. All observed stages, including meronts, sporonts, and spores were in direct contact with the host cell nucleus (principally hematopoietic cells) of chinook salmon (Oncorhynchus tshawytscha). There is no par‐asitophorous vacuole and sporogony does not involve formation of a pansporoblastic membrane as with other members of the suborder Apansporoblastina. The extrusion apparatus differentiates prior to division of sporogonial plasmodia. The spores are ovoid (1 times 2 μm) and uninucleate, and possess a coiled polar tube with 8‐12 turns. Developmental stages of the salmonid microsporidian are similar to those described for Enterocytozoon bieneusi as found in the intestinal mucosa of human AIDS patients. However, the intranuclear development, different cell types, and host infected clearly separate the salmonid and human parasites. Accordingly, the intranuclear parasite of salmonids is given the name Enterocytozoon salmonis n. sp. within the suborder Apansporoblastina.

Original languageEnglish (US)
Pages (from-to)264-269
Number of pages6
JournalThe Journal of Protozoology
Issue number3
StatePublished - Jan 1 1991


  • Enterocytozoon salmonis
  • Microspora
  • salmonid anemia
  • salmonid microsporidium
  • taxonomy
  • ultrastructure

ASJC Scopus subject areas

  • Parasitology


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