African swine fever (ASF) is a highly contagious haemorrhagic viral disease of domestic and wild pigs, which is responsible for serious economic and production losses.
It is caused by a large DNA virus of the Asfarviridae family, which also infects ticks of the genus Ornithodoros.
Currently there is no approved vaccine for ASF.
Prevention in countries free of the disease depends on implementation of appropriate import policies and biosecurity measures, ensuring that neither infected live pigs nor pork products are introduced into areas free of ASF. This includes ensuring proper disposal of waste food from aircraft, ships or vehicles coming from affected countries and policing illegal imports of live pigs and pork products from affected countries.
During outbreaks and in affected countries, control of ASF can be difficult and must be adapted to the specific epidemiological situation.
Classic sanitary measures may be employed including early detection and humane killing of animals (with proper disposal of carcases and waste); thorough cleansing and disinfection; zoning/compartmentalisation and movement controls; surveillance and detailed epidemiological investigation; strict biosecurity measures on farms.
As observed in Europe and in some regions of Asia, the transmission of ASF seems to depend largely on the wild boar population density and their interaction with low-biosecurity pig production systems. The good knowledge and management of the wild boar population and a good coordination among the Veterinary Services, wildlife and forestry authorities are required to successfully prevent and control ASF.
Depending on the epidemiological situation, the involvement of the soft tick vector should also be considered in the control programme.