African Horse Sickness Serotype 7 Confirmed in South Africa’s Cederberg; Authorities Suspend Horse Movements

South Africa | Equine health | 31 October 2026

South African veterinary authorities have confirmed African horse sickness (AHS) virus serotype 7 in a horse in the Cederberg Local Municipality of the Western Cape, prompting the establishment of an outbreak containment area, suspension of permits for horse movements out of the affected area and intensified veterinary surveillance.

The Department of Agriculture announced the confirmation on 30 October 2026. Laboratory testing by the University of Pretoria’s Veterinary Genetics Laboratory identified AHS serotype 7 in a single horse on a property located within South Africa’s established African Horse Sickness Protection Zone.

The Western Cape Department of Agriculture and Veterinary Services have initiated tracing, surveillance and census activities to determine whether other equids have been exposed or infected. Authorities have also instructed horse owners to strengthen measures against Culicoides midges, the insect vectors responsible for transmitting the virus.

The Department has strongly discouraged AHS vaccination during the current period, citing the potential for midges to transmit the live-attenuated vaccine strain. It has also confirmed that international trade partners will be notified, with further information on trade implications to follow.

The confirmation is an important development for South Africa’s equine health and disease-surveillance system. However, authorities have stated that there is currently no evidence of large-scale disease activity beyond the affected property.

Key facts: Cederberg African horse sickness case

Movement restrictions introduced under South Africa’s animal-disease legislation

Following laboratory confirmation, authorities established an outbreak containment area under the Animal Diseases Act, 1984 (Act 35 of 1984), and the Western Cape Department of Agriculture’s AHS contingency plan.

Horse movements within the controlled area ordinarily require a permit issued by the State Veterinarian: Boland. However, the Department has confirmed that no permits will be issued for horses to move out of the affected area while investigations and surveillance continue.

The restriction is intended to reduce the risk of potentially exposed horses moving beyond the containment area before the epidemiological investigation is completed.

Veterinary Services, authorised veterinarians and industry partners have commenced intensive:

• Animal tracing to identify potentially exposed equids and relevant movements.

• Surveillance to detect additional infections.

• Census activities to establish the equine population in and around the affected area.

• Investigation of the extent of potential disease transmission.

These activities will help authorities determine whether the confirmed infection remains confined to the identified property or whether further cases are present.

Horse owners, breeders, trainers, stable operators and other equine stakeholders in the controlled area have been asked to cooperate with Veterinary Services and comply with movement restrictions.

AHS serotype 7: understanding the disease and its transmission

African horse sickness is a non-contagious, vector-borne viral disease affecting equids. It is caused by African horse sickness virus (AHSV), a member of the genus Orbivirus within the family Sedoreoviridae.

The virus is transmitted primarily by infected Culicoides biting midges. Unlike diseases spread through direct contact between animals, AHS transmission is closely linked to vector activity, environmental conditions and the availability of susceptible equids.

Nine recognised AHSV serotypes are known. The identification of serotype 7 in the Cederberg case is therefore epidemiologically important because serotype identification helps inform surveillance, vaccine considerations and the assessment of circulating virus types.

AHS can cause severe disease in horses, with clinical presentation and mortality varying according to the form of the disease, the animal’s susceptibility and other epidemiological factors.

Implications for South Africa’s equine industry and international trade

The location of the confirmed case is particularly relevant. The affected property lies within South Africa’s established AHS Protection Zone, rather than the country’s AHS Free Zone.

The distinction matters because South Africa’s equine export framework depends on maintaining defined disease-control and surveillance arrangements. The Protection Zone is part of the wider system designed to protect the country’s internationally recognised AHS-free export areas.

The South African Equine Health and Protocols organisation (SAEHP), commenting on the incident, indicated that the affected property is almost 200 kilometres from the Free Zone. SAEHP also stated that there was no indication that horses already exported from the Free Zone had been exposed.