Gid in sheep12/13/2023 Unless treated surgically, the animal will die ( Scott, 2007). As the cyst grows, the clinical signs progress to depression, unilateral blindness, circling, altered head position, in-coordination, paralysis ( Bussell et al., 1997) and recumbency. The earliest signs are often behavioral, with the affected animal tending to stand apart from the flock and react slowly to external stimuli. The time taken for the larvae to hatch, migrate and grow large enough to present nervous dysfunction varies from 2 to 6 months. Acute disease is an important differential diagnosis for Cerebrocortical necrosis (CCN).Ĭhronic coenurosis typically occurs in sheep of 16-18 months of age. Occasionally the signs are more severe and the animal may develop encephalitis, convulse and die within 4 – 5 days ( Scott, 2007). There is transient pyrexia, and relatively mild neurological signs such as listlessness and a slight head aversion. The signs are associated with an inflammatory and allergic reaction. Young lambs aged 6-8 weeks are most likely to show signs of acute disease. Acute coenurosis occurs during the migratory phase of the disease, usually about 10 days after the ingestion of large numbers of tapeworm eggs. The clinical signs of the coenurosis develop when the central nervous system (CNS) of the sheep is invaded by the cystic larval stage, or metacestode of the tapeworm.Ĭoenurosis can occur in both an acute and a chronic disease form. Coenurosis is an uncommon disease of sheep although it still occurs in certain geographical areas. Usually the Coenurosis cerebralis cyst persists for the life of the intermediate host. The scolex (head of the tapeworm) embeds itself into the wall of the small intestine where it begins to grow, and shed new eggs. The life cycle is complete when the canine eats the raw infected brain, spinal cord or offal contaminated by the fluid from the ruptured cyst.The Coenurosis cerebralis matures into a thin-walled fluid-filled cyst about 5cm in diameter.The onchosphere develops into a metacestode larval stage called Coenurosis cerebralis.In goats the cysts can form in subcutaneous and muscular sites as well as the brain and spinal cord The onchosphere penetrates the mucosa and is carried via the blood stream to the brain or spinal cord.Each egg contains an onchosphere which hatches and is activated in the small intestine.The intermediate host is infected through ingestion of T.multiceps infection on a farm is significant as it confirms an unbroken sheep and dog life cycle, which in turn implies the existence of more important tapeworms such as Echinococcus granulosus. This dog / sheep tapeworm usually infects sheep and forms cysts in the lungs and liver, which if consumed by humans will cause a very serious disease that is very difficult to treat. Canine hosts shed tapeworm eggs in their feces which contaminates the pasture for the intermediate host to ingest. (2004) in goat have reported the cases of coenuriasis which could be successfully treated employing surgical procedures.Dogs and other canines such as foxes, coyotes and jackals are the definitive hosts of the tapeworm Taenia multiceps. Magroub (1972) and Aslani (1999) in sheep and Mandal et al. However, timely surgical intervention has been hailed as the best remedy to cure the afflicted animals. There is no effective medicinal treatment against the disease and the affected animals succumb to the disease. The disease is propagated by dogs, final host, consuming the brains of affected animals (sheep/goat) having cystic form of the worm (Amin et al., 2013). The intermediate stage, Coenurous cerebralis, develops in brain and spinal cord of sheep and goat on consuming the fodder soiled with dog’s faeces. The adult tapeworm reside in small intestine of dog, fox, jackal and other canines (Soulsby, 1986) and the disease is commonly found in caprine and ovine species. This disease is also known as coenuriasis or stagger. Gid (a disease of central nervous system) is caused by larval stage, Coenurus cerebralis, of adult tapeworm Taenia multiceps. Animal Production Research Institute, R.A.U, Pusa, Bihar
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |