Researchers in Norway used mailed questionnaires to follow up with more than 800 people who'd been infected with giardia 3 years earlier. About 46% of respondents reported having ME/CFS, compared to 12% of healthy controls. IBS was also reported in about 46%, compared to 14% of healthy controls.
Researchers concluded that risk of these illnesses was significantly higher in people who'd been exposed to giardia and that the consequences of infection may be higher than previously believed.
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