Cyclospora: the "explosive diarrhea parasite" explained
Every summer, a parasite called Cyclospora makes headlines — often nicknamed the "explosive diarrhea parasite" — as it turns up in produce-linked illness clusters. What it is, what to watch for, and why summer heat is the thing that makes it dangerous.
Why you hear about it every summer: Cyclospora causes produce-linked illness clusters most years in the United States, usually traced back to fresh produce — leafy greens, herbs and berries are the recurring culprits. Cases climb through the warmer months. If you want to know whether there is an active alert right now, the CDC page on cyclosporiasis is the place to check rather than a headline.
What Cyclospora is
Cyclospora is a microscopic parasite that infects the small intestine, causing an illness called cyclosporiasis. People get it by consuming food or water contaminated with the parasite — in recent years, outbreaks in the U.S. have most often been linked to imported fresh produce like herbs, salad greens, and berries. It tends to peak in the warmer months.
The symptoms
Watery, sometimes explosive diarrhea — the hallmark
Stomach cramps, bloating, gas, nausea
Loss of appetite, fatigue, and sometimes a low fever
Symptoms that can come and go and drag on for weeks if untreated
That long, relapsing course is the most useful clue. Foodborne illness varies enormously in timing — some causes begin within hours, others take days or even weeks — so it is the persistence that stands out, not the speed of onset.
Stay current: outbreak details — which products, which states, how many cases — change quickly. For the latest official information, check the CDC's Cyclospora page (cdc.gov). This article is general education, not medical advice or a live outbreak bulletin.
