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

Scientific classification

Schneider, 1881

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

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


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]


  1. Grulet, O.; Landau, I.; Millet, P.; Baccam, D. (1986). "Les Isospora du Moineau. I — Compléments à l'étude systématique" (PDF). Annales de Parasitologie Humaine et Comparée. 61 (2): 155–160. doi:10.1051/parasite/1986612155. ISSN 0003-4150.
  2. Grulet, O.; Landau, I.; Millet, P.; Baccam, D. (1986). "Les Isospora du Moineau. II — Études sur la biologie". Annales de Parasitologie Humaine et Comparée. 61 (2): 161–192. doi:10.1051/parasite/1986612161. ISSN 0003-4150.
  3. David S. Lindsay; J. P. Dubey; Byron L. Blagburn (January 1997), "Biology of Isospora spp. from Humans, Nonhuman Primates, and Domestic Animals", Clinical Microbiology Reviews, 10 (1): 19–34, doi:10.1128/CMR.10.1.19, PMC 172913, PMID 8993857
  4. Barta, JR; Schrenzel, MD; Carreno, R; Rideout, BA (June 2005). "The genus Atoxoplasma (Garnham 1950) as a junior objective synonym of the genus Isospora (Schneider 1881) species infecting birds and resurrection of Cystoisospora (Frenkel 1977) as the correct genus for Isospora species infecting mammals". The Journal of Parasitology. 91 (3): 726–7. PMID 16108579.
  • Isospora at the US National Library of Medicine Medical Subject Headings (MeSH)

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