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Eimeria is a genus of apicomplexan parasites that includes various species capable of causing .. mice (M. musculus) Eimeria weybridgensis – sheep (O. aries) Eimeria wobati – southern hairy-nosed wombat (L. latifrons) Eimeria zuernii – cattle (B. taurus). Eimeria zuernii is a species of the parasite Eimeria that causes diarrheic disease known as eimeriosis in cattle (Bos taurus), and mainly affects younger animals. Coccidiosis is usually an acute invasion and destruction of intestinal mucosa by protozoa of the genera Eimeria or Isospora. Clinical signs include diarrhea.

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Copyright and License information Disclaimer. National Center for Biotechnology InformationU. These species are tetrasporocystic, dizoic, lack Stieda bodies, and have sporocyst walls consisting of two valves joined by a longitudinal suture.

Eimeria farasanii Eimeria farra Eimeria faurei Eimeria fernandoae Eimeria ferrisi Eimeria filamentifera Eimeria franklinii Eimeria fraterculae Eimeria freemani Eimeria fulva Eimeria funduli Eimeria gallatii Eimeria gallopavonis Eimeria gasterostei Eimeria gilruthi Eimeria glenorensis Eimeria gokaki Eimeria gonzalei Eimeria gorakhpuri Eimeria granulosa Eimeria grenieri Eimeria guevarai Eimeria hagani Eimeria haneki Eimeria hasei Eimeria hawkinsi Eimeria hermani Eimeria hindlei Eimeria hirci Eimeria hoffmani Eimeria hoffmeisteri Eimeria hybognathi Eimeria ictaluri Eimeria illinoisensis Eimeria innocua Eimeria intestinalis Eimeria intricata Eimeria iroquoina Eimeria irresidua Eimeria ivitaensis Eimeria judoviciani Eimeria kinsellai Eimeria koganae Eimeria kotlani Eimeria krijgsmanni Eimeria krylovi Eimeria kunmingensis Eimeria lagopodi.

zernii Dinokaryota With a theca: A wide range of drugs are available, including those with coccidio-static reversible suppressive activity or coccidio-cidal irreversible lethal activity.

Coccidiosis typically results in diarrhoeaweight loss and dehydration.

Production of bovine coccidiosis with Eimeria zuernii.

The infection status of an animal is evaluated by examining the oocysts using different flotation methods [3]usually by counting the oocysts under a light microscope and identifying the species of the Eimeria based on morphology.


This results in many nuclei developing within the schizont. Development of first-generation schizonts of Eimeria bovis in cultured bovine cells. However, in heavy infections, it may only take two weeks for many intestinal epithelial cells to be infected with either Eimeria meronts or gametocytes. Many hosts also harbour multiple species of coccidia which may vary considerably in morphology, developmental cycle, site of infection and pathogenicity.

The species in this genus is tetrasporocystic and dizoic, and have dodecahedral sporocysts composed of two hexagonal, pyrimidal valves joined at their bases by a suture. A number of species infect rodents, including E.

The pathogenesis of the lesions produced by Eimeria zuernii in calves.

During the endogenous phase, several rounds of asexual reproductionor schizogony take place, after which the sexual differentiation of gametes and fertilisation occurs. Invasion requires the formation of a moving junction between parasite and host cell membranes.

The motile sporozoites invade the enterocytes of small intestine, and migrate to their respective sites of development. Regrettably, there are mounting problems zuerniu encountered with drug resistance amongst many coccidian species, especially that against synthetic drugs which tends to persist within zuernji populations.

Eimeria aurati – goldfish Carassius auratus Eimeria baueri – crucian carp Carassius carassius Eimeria lepidosirenis – South American lungfish Lepidosiren paradoxa Eimeria leucisci – common barbel Barbus barbus bocagei Eimeria rutili – European chub Leuciscus cephalus cabedaIberian nase Chondrostoma polylepis polylepis Eimeria vanasi – blue tilapia Oreochromis aureus.

Eimeria lamae Eimeria langebarteli Zuerni larimerensis Eimeria lateralis Eimeria laureleus Eimeria lepidosirenis Eimeria leucisci Eimeria ludoviciani Eimeria macusaniensis Eimeria magnalabia Eimeria marconii Eimeria maxima Eimeria melanuri Eimeria meleagridis Eimeria menzbieri Eimeria micropteri Eimeria minasensis Eimeriw mitis Eimeria monacis Eimeria morainensis Eimeria moronei Eimeria mulardi Eimeria muta Eimeria myoxi Eimeria myoxocephali Eimeria natricis Eimeria necatrix Eimeria neitzi Eimeria nieschulzi Eimeria nigricani Eimeria nocens Eimeria nyroca Eimeria ojastii Eimeria ojibwana Eimeria onychomysis Eimeria oryzomysi Eimeria oryxae Eimeria os Eimeria osmeri Eimeria eimeriq Eimeria ovinoidalis Eimeria palustris Eimeria papillata Eimeria parvula Eimeria pigra Eimeria pilarensis Eimeria pileata Eimeria pipistrellus Eimeria phocae.


This genus contains a single species, Crystallospora cristalloides. In a young, susceptible calf it is estimated that as few as 50, infective oocysts can cause severe disease. Parasite transmission occurs via the oral-fecal route.

Young animals are most susceptible to clinical disease, although survivors develop strong specific protective immunity against subsequent infection and disease.

The Eimeria life cycle has an exogenous phase, during which the oocysts are excreted into the environment, and an endogenous phase, where parasite development occurs in the host intestine. Retrieved 25 December However, the search for highly immunogenic antigens and overcoming antigenic variation of the parasites remains a challenge. Support Center Support Center.

Disease progression is usually so rapid that any therapeutic curative treatment may simply be too late.

Eimeria – Wikipedia

Eimeria zuernii is a very host specific parasite that only infects cattle. Most coccidial infections stimulate the development of strong protective immune responses, albeit transient unless premunitive short-lived unless parasites persist. Three species are in this genus. Eimeria amphisbaeniarum – Mann’s worm lizard Amphisbaena manni Eimeria witcheri – Mann’s worm lizard A. Membrane glyconjugates have been proposed as potential host cell receptors for Eimeria species. The main drug groups include sulfonamides sulfanilamide, trimethoprim, ethopabatepyridinoles clopidol, decoquinatenitrobenzamides zoaleneorganic arsenicals roxarsonenitrofurans furazolidone, amproliumquinazolinones halofuginonepolyether ionophorous antibiotics monensin, laslocid, salinomycin, narasinasymmetric diclazuril and symmetric toltrazuril triazines.

Views Read Edit View history. Coccidian parasites form three developmental stages: