8.1 Zoning
Zoning is one of the early actions to be taken when there is an incursion of ASF into a country. Zoning is the proclamation of geographical areas within a country into infected zones, surveillance zones and free zones. To prevent further spread of infection, the infected zones should implement two objectives: (i) quarantine and livestock movement controls and (ii) remove sources of infection as quickly as possible through slaughter of potentially infected pigs, safe disposal of carcasses and decontamination. Accordingly, active disease surveillance and preventing the entry of the disease by banning entry of pigs and pig products from the infected zones are actions which are associated with ASF surveillance and disease-free zones respectively (FAO, 1999).