By Miroslav Djuric, DVM, CAB International, Wallingford, UK.
African horse sickness is a serious and often fatal disease of horses, mules and donkeys caused by African horse sickness virus (AHSV), of the genus Orbivirus in the family Reoviridae. It can also affect zebras, camels and dogs, but not humans. Zebras and donkeys rarely develop serious disease.
The virus is spread by infected insects (mosquitoes and biting midges) and causes fever, heart and respiratory problems in affected animals. Death is common and can occur suddenly.