African horse sickness virus (AHSV) and bluetongue virus (BTV) are both members of the genus Orbivirus of the family Reoviridae. Both cause serious, noncontagious but infectious, arthropod-borne diseases in equids and ruminants, respectively. AHSV infects all equids, causing asymptomatic infection in zebra and African donkeys, but it is the most lethal infectious disease of horses

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