from a simple google search of "good bacteria"

http://www.npr.org/templates/story/s...toryId=5569230


there are many many many other cases i could point to
Transition Force Reviewed by Transition Force on . FDA approves multivirus as food additive The FDA has approved a combination of 6 virus to attack the listeria bacteria found in ready to eat meats. Lunch meats, hotdogs etc. Along with sodium nitrite in processed meats, hormones, steroids and a long list of antibiotics. How about some mayo with partially hydrodgenated oil on that. Virus as a food additive, I just cant believe it. OH! and of course its (SAFE). Rating: 5