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The 46-year-old was diagnosed with giardiasis, an intestinal infection, and was hospitalized for four days while doctors treated his symptoms, drew blood and performed a CT scan.

David Deveney suffered giardiasis after spending two hours in the River Severn, and said an investigation found an 80% chance it came from human sewage.

The Centers for Disease Control and Prevention says giardiasis can be spread by swallowing giardia from contaminated surfaces including bathroom handles, drinking contaminated water, swallowing contaminated water while swimming and eating uncooked food containing giardia.

By the time the ordeal ended, I’d lost 30 pounds to giardiasis and abandoned all hope of finishing the trail that season.

Then there were all the diseases one is vulnerable to in the woods—giardiasis, eastern equine encephalitis, Rocky Mountain spotted fever, Lyme disease, ehrlichiosis, schistosomiasis, brucellosis, and shigellosis, to offer but a sampling.