An insect-borne reovirus infection of horses, mules and donkeys in Africa and the Middle East; characterized by pulmonary edema, cardiac involvement, and edema of the head and neck.

Synonyms: Horse Sickness, African, Horsesicknesses, African, Sicknesses, African Horse, African Horse Sickness, Horsesickness, African, Sickness, African Horse, Plagues, Equine, Equine Plagues, African Horsesicknesses, African Horse Sicknesses, Horse Sicknesses, African, Equine Plague, African Horsesickness, Plague, Equine