Figure 1. Total number of herds queuing for surveillance visits, for each day, when epidemics were initiated in cattle herds located in areas with high cattle density.

A basic control strategy as described by Danish and European legislation was modelled. The black line represents the 50^th percentile, the dark gray lines represent the 25^th and 75^th percentiles and the light gray lines represent the 5^th and 95^th percentiles. The interrupted line represents the daily surveillance capacity of 450 herds.