Microsporidia

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mi·cro·spor·id·i·a

(mī'krō-spōr-id'ē-ă),
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.

Microsporidia

A phylum of ubiquitous spore-forming unicellular parasites, which have been reclassified as fungi. Microsporidia have a long polar filament and a polar cap that serves as a means of extrusion. They primarily infect infects, but crustaceans, fish and humans are not immune. Of the estimated million species of Microsporidia, 1500 have been formally named.

Microsporidia genera that cause human disease
• Brachiola—B algerae, B connori, B vesicularum.
• Encephalitozoon—E cuniculi, E hellem, E intestinalis.
• Enterocytozoon—E bieneusi (prolonged production of intra- and extracellular spores by Enterocytozoon bieneusi is not always associated with systemic disease).
• Microsporidium—M ceylonensis, M africanum.
• Nosema—N ocularum.
• Pleistophora species.
• Trachipleistophora—T hominis, T anthropophthera.
• Vittaforma species—V corneae.

Microsporidia

Parasitology A phylum of ubiquitous unicellular obligate intracellular protozoans–eg, Enterocytozoon, which infect insects and vertebrates, and humans. See Encephalitozoon species.
References in periodicals archive ?
Relatively high-intensity microsporidian infections were observed in geoduck siphons and intestinal epithelia year-round; no clear temporal or spatial environmental driver was detected.
Transovarial transmission and sex-ratio distortion by a microsporidian parasite in a shrimp.
Although the EF phylogenies suggest that, among eukaryotes, the branching of microsporidians was earliest, the HSP70 (heat-shock protein 70) phylogeny suggests that microsporidians are closely related to fungi, which diverged from animals at a later stage of eukaryotic evolution (8, 9).
In vitro propagation of the microsporidian pathogen Brachiola algerae and studies of its chromosome and ribosomal DNA organization in the context of the complete genome sequencing project.
Images of microsporidian spore discharge were recorded using a customized Nikon Optiphot-2 adapted to an Odyssey X11 laser confocal unit (Noran Instruments, Inc.).
Microsporidian protozoa are intracellular parasites common in arthropods and fish.
Morphological and molecular characterization of a new microsporidian species from the predatory mite Metaseiulus occidentalis (Nesbitt) (Acari, Phytoseiidae).
The microsporidian pathogen Vairimorpha invictae is being evaluated for release in the United States as a potential self-sustaining biological control agent for imported fire ants.
In 2014, a project was initiated to introduce the following fire ant biological control agents into the Valley: 2 species of decapitating phorid flies, Pseudacteon curvatus Borgmeier and Pseudacteon obtusus Borgmeier (Diptera: Phoridae); Solenopsis invicta virus 3 (Picornavirales: Solinviviridae) (SINV-3); and the microsporidian pathogen Kneallhazia solenopsae Knell, Allan, & Hazard (Microsporida: Thelohaniidae).
Detection of the microsporidian Enterocytozoon hepatopenaei (EHP) and Taura syndrome virus in Penaeus vannamei cultured in Venezuela.
Experimental transmission of a microsporidian pathogen from mosquitoes to an alternate copepod host.
In 2001, it was reported the incidence of microsporidian infection associated with mortalities in Penaeus japonicus in Australia (10).