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Sushi lovers, beware: stomach-burrowing parasites may bite if you try to make the Japanese delicacy at home.

An Alberta man had the misfortune of hosting the first-recorded Canadian case of a nasty parasitic worm from raw fish he bought at a grocery store.

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Doctors at Calgary’s South Health Campus were stumped when a 50-year-old man showed up in the emergency room in August 2014 in extreme pain with perpetual vomiting, doctors report in a paper published last month.

Sushi’s becoming increasingly popular. As more and more people eat sushi at restaurants, they’re going to be inclined to make sushi at home. If that’s the case, we’ll probably see more cases of this

“This is such a rare, unusual etiology, I don’t think most people would put it too high on their list,” said Dr. Stephen Vaughan, an infectious diseases consultant with a special interest in tropical medicine.

An X-ray and CT scan showed irregularities in the man’s stomach just hours after he made himself sushi at home with raw wild salmon he bought at a Calgary Superstore.

When a gastrointestinal specialist sent a little camera down his throat into his stomach, what he found was the stuff of squeamish people’s nightmares.