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(invertebrate zoology)
A subclass of protozoans in the class Telosporea; typically intracellular parasites of epithelial tissue in vertebrates and invertebrates.



an order of one-celled animals of the class Sporozoa. There are approximately 1,000 species. They are intracellular parasites of the epithelial tissue primarily of the digestive organs of invertebrates (annelid worms, mollusks, and arthropods) and vertebrates. They look like small rounded cells with a bubble-shaped nucleus.

Almost every species of Coccidia parasitizes only one definite species of animal host. Most Coccidia exhibit regular alternation of asexual reproduction (schizogony), a sexual process, and sporogony. Asexual reproduction is absent only in the most primitive group—Protococcidiida (genus Eucoccidium). Spores keep the sporozoites viable outside the host’s body for several months, until the oocyst is swallowed by the animal host. The majority of species of Coccidia develop in one host. Some Coccidia have two—for example, members of the genus Aggregata undergo asexual reproduction (schizogony) in crabs and the sexual process and sporogony in gastropod mollusks. Coccidia are very widely distributed. Some cause coccidiosis.


Kheisin, E. M. Zhiznennye tsikly koktsidii domashnikh zhivotnykh. Leningrad, 1967.


References in periodicals archive ?
Because feces spread coccidia, strict sanitation is important.
Coccidia in simple field mouse Microtus arvalis Pallas (1778) in Azerbaijan.
If ever organisms lived up to the label "parasite," it is those belonging to the order Coccidia.
However, when birds were housed in litter pens and vaccinated by various regimens (including 2 species of chukar coccidia at 100/dose), coccidiosis rapidly spread through all treatments and caused significant mortality.
But in the event you have mud puddles, damp litter or an excessive buildup of coccidia, the disease might break out in spite of the degree of protection incorporated in the feed.
30) Toltrazuril interferes with nuclear division and mitochondrial activity, which is responsible for the respiratory metabolism of coccidia.
Seeber's teacher, Wernicke, named the organism Coccidium seeberia after the protozoal subdivision Coccidia and his pupil, Guillermo Seeber (2).
No additional helminths were observed and blood and feces were negative for hematozoans and coccidia, respectively.
Parasites (viruses, coccidia and helminths) of the wild rabbit (Oryctolagus cuniculus) introduced to Canary Islands from Iberian Peninsula.
Diseases of feedlot lambs Disease Cause Signs Coccidiosis Three to four types of Diarrhea coccidia peculiar to sheep Bloody feces Salmonellosis Salmonella organisms Depression Diarrhea Elevated temperature Pasteurellosis Several organisms Forced breathing (Pneumonia) including pasteurella Nasal discharge Elevated temperature Enterotoxemia Clostridium perfringens Sudden death (Overeating) Type D Depression Convulsion Contagious Ecthyma Virus Lesions on lips, muzzle, udder, foot, head Polioencephalamocia Acute thiamine deficiency Blindness Circling Depression Watery eyes Listeriosis L.