Last updated: 29/5/2020

African Horse Sickness


African horse sickness (AHS) is a serious infectious disease affecting all species of equids, characterised by alterations in the respiratory and circulatory function and a high mortality rate in horses. AHS is endemic in Africa; where it is transmitted by at least two species of Culicoides. Nine different serotypes have been described. Laboratory diagnosis of AHS is essential. Although the clinical signs and lesions are characteristic, they can be confused with those of other equine diseases such as anthrax, equine infectious anaemia, equine viral arteritis, trypanosomosis and equine encephalosis, et al.

AHS has been reported in Thailand in March 2020 after previous outbreaks in South Asia over 50 years ago (official reports from Thailand to the OIE available here), and poses a significant challenge to the equine industry and Veterinary Services at both national and regional scale.

The OIE provides science-based standards, guidelines and recommendations for the prevention and control of AHS, diagnosis of AHS virus infection and production of high-quality vaccines. This page compiles relevant information and OIE recommendations and material on AHS.
In Asia and the Pacific region, the OIE supports Members Countries to prevent and control AHS in collaboration with local key stakeholders.

Regional Activities

Relevant  Materials from Members and partners 

International Standards on AHS

Other resources and information on AHS