Man, I never realize how common and 'big' these parastites are. Many can exist forever without showing any symptoms. And for those who complain of mild chronic problems---forget having your doctor diagnose it. These things can be there forever, and very hard to get rid of permanently.
You know how some people see white cotton balls in their stool? This is a common discription of nematodes and their little egg sacks.
All I am trying to say here, is many people should expand their suspicions to parasitic infections as a possibility for the cause of symptoms. Shroom