Equine Encephalitis

Cause, Symptoms, & Treatment

Oct 8, 2023 - 18:19
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equine encephalitis

equine encephalitis, also called equine encephalomyelitis, severe viral disease of horses and mules, transmitted by mosquitoes. It sometimes affects birds, reptiles, and humans.

There are multiple different types of equine encephalitis, including Eastern equine encephalitis (EEE), Western equine encephalitis (WEE), and Venezuelan equine encephalitis (VEE), which are among the most prevalent and are caused by strains of togavirus. The virulent Western type has a mortality as high as 90 percent in horses and 10 percent in humans. Other types include Japanese encephalitis and St. Louis encephalitis, which are caused by strains of flavivirus.

Immunity lasting one year is conferred by recovery from the disease or by vaccination with killed vaccine. Birds appear to harbour the disease but do not exhibit any definite symptoms. Mosquitoes transmit the virus from birds to horses, mules, or humans. Other animals may be infected in the same way but not show symptoms. Sheep and cats appear to be resistant.

Symptoms in horses include disturbances in equilibrium, high fever, loss of coordination, and paralysis; those in humans include headache, drowsiness, sweating, and mental confusion. Because of the symptoms the disease is often mistakenly called sleeping sickness. Treatment is aimed at making the victim comfortable. The disease can cause permanent brain damage. Control centres on eradication of mosquito carriers and the use of vaccines against the Eastern and Western strains.

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