I see them everyday in stool. I live in Oregon and although I do not use public facilities and I abstain from sex I got them somewhere and Oregon Drs at PSV and other hospitals and clinics say They are not parasites or they do not exist. The CDC told me they train doctors and wouldn't help me. If you see these in your stool please know they are contagious and an STD. Do not spread them please. If anyone knows what they are please post. I know they are parasites but have no positive ID cause Doctors refuse to believe. I have spent hundreds of dollars. Dr Amin in Arizona failed to see them and took my money. I do not recommend your wasting yours there. I am getting other tests with drskye@comcast.net but waiting results. If you know how to kill these please share.