Ouch… This is really not good.
Small doses of antibiotics — too small to kill bacteria — are fed to factory farm animals as part of their regular diet to promote growth and offset the risks of overcrowding. What factory farms are really raising is antibiotic-resistant bacteria, which means that several classes of antibiotics no longer work the way they should in humans. We pay for cheap meat by sacrificing some of the most important drugs ever developed.
Resistant bacteria are dangerous to everyone, because none of our old medications will work on them. To combat bacteria like that, we need to develop new antibiotics.