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
Local health department information and state-specific prevention guidance
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For official state health alerts, vaccination locations, and public health guidance specific to Oregon, visit your state health department's website.
Whether you live in Oregon 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: 2026-08-07
No confirmed cases reported in Oregon yet. Here are the latest Cyclosporiasis reports from our global surveillance network.
Dr. Robert Redfield, who served as director of the Centers for Disease Control and Prevention during the first Trump administration, is warning people to stay away from certain fruits and vegetables to avoid cyclospora. The CDC has confirmed 10,468 domestically acquired cases ac…
See more from the L.A. Times in Google Search. Set us as preferred California is reporting more cases of cyclosporiasis than it would on average for this point in the summer, including two recent cases where residents ate at out-of-state Taco Bell restaurants, according to state…
Investing.com -- Sysco Corp has halted purchases of iceberg lettuce from Mexico following a U.S. cyclosporiasis outbreak, CEO Kevin Hourican told Reuters on Tuesday. In mid-July, Sysco-- the largest U.S. food distributor-- stopped sales and distribution of Taylor Farms iceberg l…
Joe Buczek is manager of digital content and promotion at CBS Detroit. He previously worked at WWTV, the Grand Traverse Insider, the Leader and the Kalkaskian, the Oakland Press and the Morning Sun. An additional 33 Michigan residents have required hospital care for cyclosporias…
Data by one test-maker shows a positivity drop, but rate could be influenced by number of people taking test The maker of a popular laboratory test said the cyclosporiasis outbreak in the US may be slowing. An outbreak of infections from the single-celled parasite has grown to m…
The patients had "significant underlying health conditions" that may have contributed to their deaths, health officials said. On Monday, health officials in Michigan reported two deaths linked to cyclosporiasis, an intestinal illness caused by the parasite cyclospora, which spre…
Add Yahoo as a preferred source to see more of our stories on Google. If you've been following the news, you're probably aware of the cyclospora outbreak that has fruit and vegetable lovers nationwide in a frenzy. According to experts, however, it's best not to panic since there…
The public discussion around the cyclospora outbreak, the largest in U.S. history, initially focused on food safety: How could the parasite be killed? What foods were affected? Then, suddenly, social media chatter lurched into conjecture about politics. Much of the online discu…
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