Cyclosporiasis is an intestinal illness caused by the microscopic parasite *Cyclospora cayetanensis*. It primarily affects humans, causing prolonged watery diarrhea, and is most often linked to consuming contaminated fresh produce or water. While found globally, outbreaks have been common in developed countries due to imported produce.
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The parasite *Cyclospora cayetanensis* was first observed in stools in 1979 but was recognized as a significant human pathogen in the early 1990s. Its historical significance grew due to large foodborne and waterborne outbreaks, particularly in North America, often linked to contaminated fresh produce. This led to increased public health awareness and research into its epidemiology.
Cyclosporiasis is transmitted through the fecal-oral route, primarily by ingesting food or water contaminated with mature *Cyclospora cayetanensis* oocysts. Direct person-to-person transmission is unlikely because the oocysts passed in stool are not immediately infectious; they require days to weeks to sporulate (mature) in the environment. Outbreaks are frequently associated with contaminated fresh produce such as raspberries, basil, or leafy greens.
Contagious Period: Varies by disease
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Whether you live in Vermont or are traveling there, knowing the symptoms, timeline, and when to seek care helps you act quickly if exposure occurs.
Seek care if you experience severe dehydration, bloody stools, high fever, or symptoms lasting more than 3 days. Children under 5, adults over 65, and immunocompromised individuals should seek care earlier.
Emergency symptoms: Severe dehydration, inability to keep fluids down for 12 or more hours, or neurological symptoms require emergency care.
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Trusted information from leading health organizations
Official guidance from the U.S. Centers for Disease Control and Prevention
View CDC Resources →Global disease surveillance and guidelines from the World Health Organization
View WHO Resources →Disease information on Virus Watcher is reviewed by our Chief Epidemiologist, a former CDC lead analyst for FluSight forecasting. Outbreak data is aggregated from verified sources including BEACON, ProMED, WHO, CDC, and 50+ national health agencies. This information is for educational purposes and should not replace professional medical advice.
Last reviewed: 2026-09-01
No confirmed cases reported in Vermont yet. Here are the latest Cyclosporiasis reports from our global surveillance network.
The Food and Drug Administration's (FDA) decision to classify recalled iceberg lettuce linked to a nationwide cyclospora outbreak as a Class I recall, its most serious category, may leave many consumers wondering whether lettuce is still safe to put on the dinner table. The clas…
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An infectious disease expert has issued advice to travellers following an outbreak of an 'explosive diarrhoea' infection in the US and Mexico. It comes as health officials in Michigan in the US have confirmed the first two deaths linked to cyclospora, which is a parasite that cau…
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The state has now reported 315 cyclospora cases this year. The 2026 case count is now higher than at this time in recent years Texas has reported more than 100 additional cyclosporiasis cases in the past week, according to state health authorities, for a total count of 315 repor…
This summer has been particularly tough for foodborne illnesses, with reports of explosive diarrhea, severe stomach cramps, hospitalizations, and even deaths. Not all reported outbreaks have reached Florida, but as federal agencies investigate cases of salmonella, E. coli and cy…
Outbreaks of severe foodborne illnesses, causing symptoms including "explosive diarrhea," have soared across the country this summer. With health officials working to address continually growing outbreaks of the parasitic illness cyclosporiasis, Trump administration health offic…
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