It was dumb when they released the prize bull into an anthrax infected herd to prove a point. The point being that the anthrax vaccine worked. So the bull wanders into the small herd, promptly gets anthrax in a matter of minutes, falls over, and appears dead. The professor runs over there and injects the bull with the anthrax vaccine. A minute later, the bull twitches, then gets up. He's just fine!
Vaccines do not work that way. They are a preventative measure, not a cure.