Bryan, a food broker from Michigan, wasn’t sure if he’d be able to make it to urgent care in time. He started feeling off on Thursday, and by Saturday, he was having to use the bathroom every 15 to 30 minutes.

“It’s no joke about the explosive diarrhea,” Bryan, who asked that his last name be withheld for obvious reasons, told me. I met him via Reddit, where I recently spent hours lurking in threads about cyclosporiasis, the explosive diarrhea illness infecting people across the country, and Cyclospora cayetanensis, the microscopic parasite that causes it, which spreads through human fecal contamination. Symptoms – including nausea, loss of …

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