Believe it or not, 28.8 million pounds (13.1 million kilograms) are sold in the US for use in farm animals! The antibiotics that these animals use are the exact same ones that are utilized by humans! Unfortunately, the overuse of these drugs in animals could be problematic.
Organisms on the farms can become immune to the medicine used on the animals. This means that the organisms also become immune to the medicine on humans and could spread disease!