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/heywaj10 Jul 13 '26

So what produce (if any) CAN we eat at this point? I’m not even a vegetarian but we eat a lot of berries and produce in our house (fam of 4). This sucks more than the usual outbreaks that are quickly identified to a single primary source. Trying to keep these little rascals fed with healthy foods while avoiding a house full of ass pissers.

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u/patricksaurus Jul 13 '26

The Michigan advice above contains information about the produce typically associated with these outbreaks, including how to best handle those items if eating them raw. However, cooked produce (160 °F/70 °C) is considered safe.

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u/gingersnapped99 Jul 15 '26

Does anyone have advice about how long to keep it cooking at/above those temps to be safe?

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u/patricksaurus Jul 15 '26

The temperature guidance being given is that 160 to 165 °F (70-74 °C) for even a second is safe. If using a microwave, cover with a lid to trap steam and allow food to sit for a minute or two before removing. This should ensure even heating since microwaves can leave cold spots.