It is not really the overuse of antibiotics in people causing the problem so much as the use of antibiotics in livestock and food. Cows, pigs, chickens, etc are all dosed preventatively to keep them from getting sick. It is put in the food and water. MSRA and other 'super' bugs have come directly out of feed lots. It is really scary. And, while not finishing antibiotics doesn't help, it doesn't do as much harm as one would think.
The best way to fight these is buy organic - especially milk and meat!
A little birdie shared this with me today and I agree with it.