Foot-and-mouth disease
From Tardis Wiki, the free Doctor Who reference
Foot-and-mouth disease was a disease on Earth that was sterilised by killing the livestock. Klineman Halpen compared his solution to Ood red-eye — gassing the "infected" — to the solution used here. "It still works, you know." (TV: Planet of the Ood (TV story)|Planet of the Ood)