Here are a couple of sites to look into regarding fecal BO or rotten egg BO,and how a few people got rid of theirs. I have'nt heard many people talk about Anaerobic infections but it may be something to look into for some with your doctor. Others may decide to go another route.
http://www.whale.to/a/cure1.html This site list list different ailments where people have placed info regarding healings for certain ailments, I'm only talking about the odor cures, feel free to research anything else at your own if you feel the need too.