Stool and blood work are the methods used to detect parasites. Here's how they are acquired:
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Sometime ago, I posted about my sister who returned from a conference in Dallas. Afterwards she was terribly ill with a multitude of symptoms, mostly gastro-intestinal. This continued for about six weeks. After MRIs, Ct scans, blood work, and every other diagnostic known to medicine, it was determined that she had picked up some kind of parasite while in Dallas. The tell-tale symptom......burning pain in the soles of her feet! Weird, huh? On treatment for it now and doing much better.....also lost about 40 lbs.