What to know about the parasitic outbreak giving ‘explosive’ diarrhea to people on Canada’s doorstep

Michigan, Ohio and several other U.S. states are experiencing an uptick in a stomach illness that can result in 'explosive' diarrhea. Photo by Ake Ngiamsanguan /Getty Images

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A microscopic parasite that procreates in your stomach and can cause ‘explosive’ watery diarrhea has resulted in an outbreak affecting over 1,000 people in the U.S., most of them in the border state of Michigan.

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Health officials throughout the U.S. are investigating to identify the sources of a surge in cyclosporiasis cases, an infection caused by Cyclospora cayetanensis. While very rarely fatal, symptoms of the foodborne gastrointestinal illness can last several weeks.

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The Public Health Agency of Canada, in an email to National Post, said the parasite isn’t commonly found on food and water in Canada, though Canadian cases of cyclosporiasis do increase in the spring and summer as people eat more imported fresh fruit and vegetables.

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That said, PHAC “is not currently investigating any Cyclospora outbreaks in Canada.”

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Here’s what to know about the situation south of the border.

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Where is the outbreak?

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It’s not uncommon for cases of cyclosporiasis to arise in the spring and summer months, according to the U.S. Centre for Disease Control, but its officials and those from the Food and Drug Administration said they are seeing more than normal across several states.

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As of Thursday morning, the Michigan Department of Health and Human Services is reporting 1,251 cases, up from up from 992 the day prior and and 572 on Saturday.

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Historically, the state has averaged 40 to 50 cases annually.

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Across state lines in Ohio on Wednesday, the Department of Health confirmed 177 cases as of July 2, resulting in 28 people hospitalized.

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The CDC said hundreds of cases are spread across 15 other states, but its website doesn’t show any data collected after June 16. As reported by CNN, clusters have been identified in Illinois, New York State (and city), Pennsylvania, Texas, Alabama, Kentucky, Tennessee, Virginia, and West Virginia.

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What is causing the outbreaks?

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As of Thursday, the CDC, FDA and the individual states are still trying to identify the source and determine whether they are all connected.

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“CDC has no evidence of a single, multistate Cyclospora outbreak linking cases happening right now and being reported in the press,” the organization wrote in an email to NBC News.

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It also confirmed that reported cases didn’t include anyone who travelled to a country where cyclosporiasis is endemic.

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Investigations into cyclosporiasis outbreaks are often challenging to solve because the parasite can’t be detected by most of the routine stool tests, meaning it often gets missed. Moreover, given its incubation time in the gut, patients often have a hard time remembering what they ate and when. Furthermore, because produce from multiple places is frequently mixed during packaging and distribution, tracing contamination back to a single source can take months.

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What causes cyclosporiasis?

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People can become infected after consuming food or water contaminated with the single-celled parasite, most commonly via fresh produce that has been exposed to human fecal contamination during growing, harvesting or processing.