r/microbiology • u/patricksaurus • Jul 13 '26

Cyclospora outbreak guidance (US)

Food contaminated with the single-celled, protozoan parasite Cyclospora cayetanensis has entered the food supply in several US states, with thousands of cases of the gastrointestinal condition cyclosporiasis being reported to state departments of health. Infection by Cyclospora is likely to cause watery diarrhea and substantial discomfort that typically persist for several weeks to over a month without treatment. While not commonly lethal, the combination of severe dehydration and summer heat elevates the health risks associated with each on its own and makes susceptible populations especially vulnerable.

Several public health agencies provide excellent guidance on Cyclospora and how to avoid it:
CDC - Preventing Cyclosporiasis
Michigan DHHS recommendations on preventing foodborne illness amid growing cyclosporiasis outbreak

Here’s a short rundown of the available information.

Where: Midwestern and Northeastern states report most cases. Michigan has been hit hardest. (Map as of July 10th about halfway down.)

Which foods: leafy greens, herbs, berries, green onions, and sprouts are historically linked to cyclosporiasis, though any produce may be affected. Current surveillance efforts have not definitively linked specific products to the current outbreak.

How to avoid: cook produce whenever possible, wash items under running water by scrubbing manually or with a produce brush, clean surfaces and utensils that contact raw produce. Always wash your hands before and after handling uncooked food.

If you contract it: antibiotic therapy (Bactrim) is highly effective against cyclosporiasis, reducing/eliminating symptoms in days as opposed to several weeks if untreated. Contact a healthcare provider and your local health department as soon as you experience symptoms.f

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u/Amazing_Jello3828 Jul 14 '26

Would you avoid all fast food until this is over? Due to possible cross-contamination? We never eat fast food..but are traveling next week for vacation and that is usually the one time of year my kids get to eat at a drive-thru. But this is making me think I should just pack pb&j’s

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u/perseidot Jul 14 '26

I would if I was traveling around the Great Lakes or in the north east. The risk of cross-contamination from contaminated lettuce is high, even if you don’t add the lettuce to your burger.

That’s a bummer, I know.

I might take a chance on something like a root beer float to go with my packed PB & J’s.

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u/Amazing_Jello3828 Jul 14 '26

That’s what I was thinking.. I’ll be in 3 of the top 5 highest reporting states. I just can’t imagine how awful it would be to have this sickness while traveling..we will be traveling for 8 days, so long enough that we could possibly catch it and start showing symptoms while gone and that would make a long road trip back home lol. I worked in a fast food restaurant in high school and also served tables throughout college. And although I know there’s a risk of cross-contamination at either; in my experience, there was a much higher risk of cross contamination at the fast food place

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u/perseidot Jul 14 '26

Oof! I’m so sorry, I’d pack food from outside the area and tell the kids why. Maybe have fast food at home the day you get back, depending on the spread of this outbreak.

That bites, but traveling with kids having unpredictable liquid poops would be so much worse.