Public health officials are monitoring a rise in cyclosporiasis cases, an intestinal illness caused by the parasite Cyclospora cayetanensis. The Centers for Disease Control and Prevention (CDC) reported 145 cases between May 1 and June 16, including a cluster in Pennsylvania and New Jersey. While the infection is typically not fatal, its symptoms can persist for weeks if left untreated.
Tracking the 2026 Cyclospora Outbreak
Data from state health departments indicate varying infection rates across the U.S. As of July 9, Michigan health officials reported more than 1,200 diagnosed cases, while Ohio officials confirmed 177 cases as of July 2, according to state health releases. In Pennsylvania, the Department of Health recorded 28 cases this year, with 14 occurring in Southeastern Pennsylvania.
Comparing these figures to historical data provides context on the parasite’s prevalence. Pennsylvania reported 40 cases in 2025 and 87 cases in 2024. Health officials note that while cyclosporiasis can occur throughout the year, transmission typically rises during the spring and summer months.
Understanding Cyclosporiasis Symptoms and Transmission
The primary symptom of cyclosporiasis is watery, sometimes “explosive” diarrhea. Patients may also experience bloating, cramps, fatigue, increased gas, and a loss of appetite. Less frequent symptoms include vomiting, body aches, and a low-grade fever.
The infection is transmitted through the consumption of contaminated food or water. The parasite is endemic to tropical and subtropical regions, but foodborne outbreaks in the U.S. are usually linked to imported produce. The FDA identifies basil, cilantro, raspberries, and snow peas as common vehicles for the parasite. Once a person is exposed, symptoms typically appear after an incubation period of approximately one week.
Pro Tips for Prevention
- Untreated infections can last from a few days to a month or longer.
Frequently Asked Questions
Is cyclosporiasis a life-threatening illness?
No, the infection is generally not considered life-threatening, and there have been no reported deaths from the illness so far this year, according to public health data.
Do all people infected with Cyclospora show symptoms?
Not necessarily. The FDA notes that some people show no symptoms.
How is the infection treated?
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