The mean result of 500 simulations for the 3 km protection zone, the 10 km surveillance zone and the whole region.

Results are given for each zone and cumulatively across zones. They are the number of farms, the expected number of undiscovered infected farms and the system sensitivity if all farms in the zone were sampled with an on-farm survey of 100% sensitivity.1The total number of animal holdings within the zone.2The expected number of farms in the zone that will have an undiscovered infection.3The estimated system sensitivity to detect previous infection in the entire region if all the farms in the particular zone are sampled and tested.