  Using a cellular automata model, we simulate the British Government Policy
(BGP) in the 2001 foot and mouth epidemic in Great Britain. When clinical
symptoms of the disease appeared on a farm, there is mandatory slaughter
(culling) of all livestock on an infected premise (IP). Those farms that
neighbor an IP (contiguous premise, CP), are also culled, aka nearest neighbor
interaction. Farms where the disease may be prevalent from animal, human,
vehicle or airborne transmission (dangerous contact, DC), are additionally
culled, aka next-to-nearest neighbor iteractions and lightning factor. The
resulting mathematical model possesses a phase transition, whereupon if the
physical disease transmission kernel exceeds a critical value, catastrophic
loss of animals ensues. The non-local disease transport probability can be as
low as .01% per day and the disease can still be in the high mortality phase.
We show that the fundamental equation for sustainable disease transport is the
criticality equation for neutron fission cascade. Finally, we calculate that
the percentage of culled animals that are actually healthy is ~ 30%.
