I think you are largely wasting your time trying this route - the history of medicine has always been fraught with errant thinking and to think that sick people are going to change them is wrong imo. This is like trying to drive through a traffic jam when the better alternative is to find the route that does not impede us. Forgive me if this sounds harsh.
I do not waste time with this issues. Even if the doctor concedes then what are they going to do? Prescribe 3 days of Flagyl? They are just going to follow the recommended doses anyhow which are generally not enough. Secondly they are not going to prescribe unless they have a positive on a test. It is well known that testing is inaccurate and this comes from 2 Infectious disease doctors I talked to.
1.) parasites are only found in sub-Saharran Africa, Indian sub-continent, southeast Asia.
>Predominately yes but not 100% true. parasites are typically transmitted through improper sanitation such as water supplies and these areas are pandemic with poor sanitation. Globalization is a factor they overlook. http://www.ncbi.nlm.nih.gov/pubmed/24140284
Many documented cases of parasite outbreaks such as the Cryptosporidium outbreak in Milwaukee. A cyclospora outbreak in Iowa has sickened 138 and Iowa also reports a cryptosporidium outbreak (76 cases).
2.) Herbs and/or Steroids don't cause scattering and migration
3.) Co-infections of parasites don't exist in North America