Alert: Cyclospora Cayetanensis Multistate Outbreak with Midwest Epicenter
Public health officials are investigating a multistate outbreak of Cyclospora cayetanensis with a concentration of cases in the Midwest. The parasite causes intestinal illness, and authorities are working to identify the source of contamination to prevent further spread.
Background
- Cyclospora cayetanensis is a single-celled parasite that causes cyclosporiasis, an intestinal infection marked by watery diarrhea, cramping, nausea, and fatigue. Unlike bacteria or viruses, it doesn't spread directly between people — it is transmitted through contaminated food or water.
- The CDC and FDA track multistate foodborne outbreaks to identify the contaminated source (often imported produce like fresh herbs, berries, or salad mixes) and prevent further cases. A "Midwest epicenter" means a disproportionate number of cases are clustered in states like Iowa, Nebraska, Wisconsin, or Illinois.
- These outbreaks typically occur in spring and summer. Because Cyclospora has a 1–2 week incubation period and requires a lab test not included in standard stool cultures, cases are often underdiagnosed.
- The alert suggests healthcare providers should consider cyclosporiasis in patients with prolonged diarrheal illness, especially if they report eating fresh produce common to past outbreaks.