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.
|Published (Last):||11 October 2007|
|PDF File Size:||7.27 Mb|
|ePub File Size:||8.70 Mb|
|Price:||Free* [*Free Regsitration Required]|
Developing oocysts contain numerous eosinophilic wall-forming bodies which give rise to the tough outer oocyst walls. Babesiidae Babesia Theileriidae Theileria. Environmental factors can influence how fast new oocysts become infective and management of the animals living conditions and feed and how easily the animals get infected.
Images in this article Fig. There has been considerable success with control through immunoprophylaxis using attenuated or precocious strains of parasites, particularly in the poultry industry. New hosts are infected when they ingest sporulated oocysts contaminating food or water supplies faecal-oral transmission. Disease progression is usually so rapid that any therapeutic curative treatment may simply be zueenii late.
Many industries recommend periodic rotation between different drug groups and the use of combination cocktail drugs to minimize the occurrence of resistance. The development of the first asexual generation causes few changes in the lower ileum.
Young animals are most susceptible to clinical disease, although survivors develop strong specific protective immunity against subsequent infection and disease.
Infection with Eimeria results in life-long immunity to that particular parasite species, but does not give cross protection against other species.
Unsporulated oocyst, sporulated oocyst, sporozoite and second-generation merozoite”.
Production of bovine coccidiosis with Eimeria zuernii.
University of New Mexico. Infections have been recorded throughout the world in most vertebrate species, including eutherian and metatherian mammals, birds, reptiles and fish. Explicit use of et al. Eimeria oocysts exhibit a characteristic 1: A whole genome sequencing project is in progress with chosen species, Eimeria tenella.
Mature schizonts appear as membrane-bound clusters of small basophilic bodies similar to bunches of grapes. Most coccidian species are considered to be highly host-specific and only parasitize single host species oioxenousalthough some species in birds and reptiles may parasitize closely-related hosts stenoxenous and a few species in fish may parasitize unrelated hosts euryxenous. For this reason, continuous in-food or in-water medication is often used for prophylactic preventative treatment in many intensive animal industries.
Merozoite invasion also requires the formation of a moving junction, however the proteins involved in this process differs from those on sporozoites. The most prevalent species of Eimeria that cause coccidiosis in cattle are E. Uses authors parameter link CS1 maint: This process is known as gliding motilitywhich is conserved across all species of Apicomplexa.
This page was last edited on 10 Septemberat Eimeria zuernii Scientific classification Domain: Unsporulated oocysts contain a developing sporoblast which eventually undergoes sporulation forming sporocysts which contain the infective sporozoites.
The pathogenesis of the lesions produced by Eimeria zuernii in calves.
The species in this genus are tetrasporocystic, dizoic, possess Stieda bodies, and undergo merogony and gametogony on the lumenal surface of the intestinal tract.
There is also a greater diversity of variant surface antigens found on the surface of merozoites. There are three sequential stages in the parasite life-cycle: Abstract The pathogenesis of the lesions caused by Eimeria zuernii in calves is described. A number of species infect rodents, including E.
A combination of these factors may result in poor growth and death of the animal, particularly amongst young. Resolution of these lesions takes place in approximately ten days in calves which survivie.
The majority of the parasites life is in the environment and both survival of the parasite as well as developing into an infective oocysts depends on these factors. From Wikipedia, the free encyclopedia. Five species infect llamas and alpacas: The release of new oocysts destroys mucosal cells which can lead to loss of serum and blood.