"Bovine tuberculosis (TB) is an infectious disease of cattle and one of the biggest challenges facing the cattle farming industry today, particularly in the west and south west of England. It is caused by the bacterium Mycobacterium bovis (M. bovis), which can also infect and cause TB in badgers, deer, goats, pigs, camelids (llamas and alpacas), dogs and cats, as well as many other mammals."

Note: "Mycobacterium bovis (M. bovis, the causative agent of bovine tuberculosis)" can also infect donkeys, horses, dogs and cats.

Looks to me like the fellow got lucky--and his herd, too.