After having a stellar digestive track for the last 43years, immediately after my return from a three- week trip in June on thesouthern end of the AT, where I drank untreated water a few times, I startedhaving diarrhea. After going to the ER, ageneral practitioner, and a gastroenterologist and giving each of them a stoolsample (all of which came back negative for anything like Giardia or cryptosporidium)and having a colonoscopy, everybody is just scratching their heads. I’m wondering if the problem is that thedoctors in Columbus, Ohio, haven’t had much experience with this kind of thing,whereas a doctor nearer to the AT or other wilderness areas might know what todo. If anyone knows anyone, I’d love tobe able to call him or her and get his or her insight—I might even considerdriving 7 or 8 hours to get an appointment with him or her. Any help would be appreciated!