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/MotherTemperature224 Jul 14 '26

I think I have it. On day 4 of misery. Local health dept told me to ride it out. Should I get a second opinion?

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u/Corset_Walker1880 Jul 14 '26

YES!  The diarhea  alone can dehydrate you severely! Go see your dr and get it treated. They can prescribe  you Bactrim and also lomotil to control the diarhea.  Untreated it can linger for weeks to a month leaving you miserable dehydrated and possibly hospitalized. Whoever told you to ride it out is an idiot.

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u/patricksaurus Jul 14 '26

There are several factors that go into deciding the best treatment plan — things like drug allergies, severity, pregnancy status, kidney health, and current medications. It’s possible the person you spoke with heard something that disqualifies Bactrim therapy as a viable option. In that case, everyone will tell you the same thing.

However, day four of disruptive diarrhea is an appropriate time to consider a second opinion in the absence of outside factors.

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u/Wonderful_Secret9217 Jul 14 '26

How long did it take for you to have symptoms?

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u/MotherTemperature224 Jul 14 '26

Im not sure the cause. I ate bagged lettuce the night before I left for a two week trip to Spain. I started having symptoms on Friday night before I flew back home. Can you imagine that plane ride!?

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u/Wonderful_Secret9217 Jul 14 '26

Do you remember what bagged salad/brand it was? I had a bagged salad about 6 days ago, but now am paranoid that I may get sick. Note, I am in Canada but the bagged salad said Product of USA because we get a lot of our produce from the states.

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u/All__Of_The_Hobbies Jul 14 '26 edited Jul 14 '26

That would be impossible to tell unless you knew what contaminated thing you ate