Adult horses are more likely than younger ones to transmit the virus without showing signs of infection.ĮHM results from widespread vascular or blood vessel injury after damage to the lining of the blood vessels of the blood-brain barrier. Respiratory disease caused by EHV is most common in weaned foals and yearlings, often in autumn and winter. The two most common species are EHV-1, which causes abortion, respiratory disease and neurologic disease and EHV-4, which usually causes respiratory disease only but can occasionally cause abortion and rarely neurological disease. EHV-4: Causes a nonfatal upper respiratory tract disease in foals and is uncommonly associated with abortion and rarely with neurological disease.ĮHV is a common DNA virus that occurs in horse populations worldwide.EHV-3: Causes a venereal disease called coital exanthema that affects the external genitalia but has not been shown to affect fertility.EHV-1: Can cause four manifestations of disease in horses, including neurological form, respiratory disease, abortion and neonatal death.There are more viruses in this family, but EHV 1, 3, and 4 pose the most serious health risks for domestic horses.Įquine herpesvirus myeloencephalopathy (EHM) is another name for the neurologic disease associated with equine herpesvirus (EHV) infections.
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This is a family of viruses which are named by numbers such as EHV 1, 2, 3, 4 and 5.
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It is currently unknown what causes some infected horses to develop the serious neurological forms associated with EHV1 that may be fatal.Ģ.
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Almost all horses have been infected with the viruses and have most of the times no serious side effects. Equine herpesviruses are DNA viruses that are found in most horses all over the world.