Isospora

Isospora is a genus of internal parasites in the subclass Coccidia.^[1][2]

Isospora
Scientific classification
Domain:	Eukaryota
Clade:	Diaphoretickes
Clade:	Sar
Clade:	Alveolata
Phylum:	Apicomplexa
Class:	Conoidasida
Order:	Eucoccidiorida
Family:	Eimeriidae
Genus:	Isospora Schneider, 1881
Species
I. almaataensis I. anseris I. ashmoonensis I. bahiensis I. bigemina I. bronchocelae I. buteonis I. buteonis I. cardellinae I. hammondi I. heydorni I. hominis I. mandari I. mejiro I. neorivolta I. peromysci I. rara I. ratti I. rivolta I. thibetana I. wallacei

Figures 1–2; Sporulated oocysts of Isospora machadoae sp. nov. recovered from Turdus albicolis from Brazil: (1) line drawing; (2) photomicrographs. Note the micropyle and micropyle cap (m/mc), nucleus (n), polar granule (pg), refractile body (rb), rough oocyst wall (row), Stieda (sb) and sub-Stieda bodies (ssb) and the sporocyst residuum (sr). Scale bar = 10 μm.

It is responsible for the condition isosporiasis, which causes acute, non-bloody diarrhoea in immunocompromised individuals.

Taxonomy

At least 248 species were originally described in this genus. For instance, the house sparrow has 12 species of Isospora.^[1][2] However, most species are little studied, and some authors doubt whether all should be recognized as distinct species.^[3] In 2005, all former Isospora species that infect mammalian hosts were reclassified as members of the genus Cystoisospora, a member of the Sarcocystidae family.^[4]