The prevalence of intestinal parasites is not greater among individuals with irritable bowel syndrome: a population-based case-control study
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Danish IBS cases (n=124) carried Dientamoeba fragilis or Blastocystis less often (36%) than controls (n=204; 50%). A Jordanian hospital case-control study (109 IBS, 100 controls) found higher detection of Giardia, Cryptosporidium and Blastocystis among patients. Neither proves universal parasite causation.
Different geographies, organisms, assays and sampling. Positive detection alone does not prove symptom causation.