AHS is endemic in the sub-Saharan region and certain parts of South Africa, where severe epidemics occur in naïve horse populations (Lord ''et al.'', 2002; Coetzer & Guthrie, 2004). AHS occasionally occurs as outbreaks in North Africa, intermittently spreading to the Mediterranean area and the Middle East. | AHS is endemic in the sub-Saharan region and certain parts of South Africa, where severe epidemics occur in naïve horse populations (Lord ''et al.'', 2002; Coetzer & Guthrie, 2004). AHS occasionally occurs as outbreaks in North Africa, intermittently spreading to the Mediterranean area and the Middle East. |