The U.S. Centers for Disease Control and Prevention is tracking a surge of cyclosporiasis, a parasitic stomach infection, across the United States [1].
This outbreak is significant because the parasite, Cyclospora cayetanensis, causes severe gastrointestinal distress and is often linked to the consumption of contaminated fresh produce [2, 5].
Data regarding the scale of the outbreak vary across reports. One CDC-referenced report said at least 145 people have become sickened across 17 states [3, 4]. However, other reports cite a much larger impact, stating there are nearly 7,000 confirmed or probable cases of cyclosporiasis [1].
Regional clusters have emerged in several areas. Michigan reported more than 170 confirmed cases as of June 30, 2025 [3]. Other reports of stomach bug surges were noted in Massachusetts and the Metro Detroit area [3, 6].
Health officials said that contaminated ingredients served at some fast-food locations may have contributed to the spread [5]. In response, some Taco Bell locations reportedly pulled specific ingredients from their menus as cases of the parasite surged [5].
While some reports from 2025 mentioned a rise in norovirus cases during the same period, the CDC's specific investigation into this parasitic outbreak focuses on the Cyclospora parasite [1, 3, 6]. This parasite differs from viral infections in how it is transmitted, and treated.
“The outbreak is caused by the parasite Cyclospora cayetanensis, which leads to explosive diarrhea.”
The discrepancy in case numbers—ranging from 145 to nearly 7,000—suggests a wide gap between laboratory-confirmed cases and probable cases reported through surveillance. Because cyclosporiasis is linked to the food supply chain, particularly fresh produce, this surge indicates a potential systemic failure in agricultural or distribution safety protocols that can affect multiple states simultaneously.
