Zombie Toxin
A dead horse infects two men with a disease that turns them in to overacting, poorly made up zombies. As they carry on defecating and vomiting on each other they contaminate a field of yeast, giving two Nazi-wannabes the idea of buying the infected field, selling the yeast in home wine-brewing kits and destroying the rest of humanity by spreading the infection.
Directors: Thomas J. Moose
IMDB: tt0374353