Model used for the simulation of disease spread.

<p>The disease spreads as a circle at km/day. Once the disease has reached a municipality centroid, each uninfected herd in the municipality can become infected with a daily probability . Once a herd is infected, each cow from the herd can become infected with a daily probability . Squares on the left-hand side represent herds. On the right-hand side, black dots and red dots represent uninfected and infected cows respectively.