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Equine protozoal myeloencephalitis in various stages. Equine protozoal myeloencephalitis (EPM) is a disease that affects the central nervous system of horses. It is caused by a protozoal infection that is brought about by the apicomplexan parasites Sarcocystis neurona or Neospora hughesi. Most cases are caused by S. neurona.
Neospora hughesi is an obligate protozoan apicomplexan parasite that causes myelitis and equine protozoal myeloencephalitis (EPM) in horses, and has only been documented in North America. [1] EPM is a neurological disease from lesions in the spinal cord, brain stem, or brain from parasites such as N. hughesi or Sarcocystis neurona. [2]
The protozoan Sarcocystis neurona is a protozoan of single celled character and belongs to the family Sarcocystidae, in a group called coccidia. [1] The protozoan, S. neurona , is a member of the genus Sarcocystis , and is most commonly associated with equine protozoal myeloencephalitis (EPM). [ 2 ]
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Sarcocystis is a genus of protozoan parasites, with many species infecting mammals, reptiles and birds.Its name is dervived from Greek sarx = flesh and kystis = bladder.. The lifecycle of a typical member of this genus involves two host species, a definitive host and an intermediate host.
Infectious causes affecting the nervous system may be bacterial, viral, protozoal, or rickettsial. Those that commonly alter gait include tetanus, botulism, Lyme disease, equine protozoal myeloencephalitis (EPM), rabies, West Nile virus, equine encephalitis virus, and equine herpesvirus 1.
The acute symptoms of contagious equine metritis include acyine inflammation of the uterus, an obvious thick, milky, mucous vulvar discharge 10 to 14 days after a live covering by a stallion. Chronic symptoms include milder uterine inflammation that will cause less obvious vulvar discharge, and then the infection may be more difficult to eliminate.
Strangles (also called equine distemper) is a contagious upper respiratory tract infection of horses and other equines caused by a Gram-positive bacterium, Streptococcus equi. [1] As a result, the lymph nodes swell, compressing the pharynx , larynx , and trachea , and can cause airway obstruction leading to death, hence the name strangles. [ 2 ]