U.S. health officials are monitoring a cyclosporiasis outbreak that has sickened between 1,700 [1] and 2,000 [2] people across the United States.
The outbreak is significant because the parasite, Cyclospora cayetanensis, is difficult for investigators to trace. Because the organism cannot be reproduced in a lab [1], officials struggle to identify the specific food source responsible for the infections.
The Centers for Disease Control and Prevention (CDC) reported that the parasite causes a food-borne infection characterized by severe gastrointestinal distress. "Symptoms can include frequent and sometimes explosive bowel movements," the CDC said [1].
Health officials have confirmed the presence of the parasite in at least 17 states [3], though some reports indicate the reach extends to more than two dozen states [1]. The outbreak has been ongoing since 2024 [1].
Despite the severity of the symptoms, the infection is not considered fatal [1]. However, the inability to culture the parasite in a laboratory setting means it is not always detected during standard food testing [1]. This gap in detection makes it difficult to issue precise recalls for contaminated produce, or other food products.
Investigators continue to analyze the commonalities between the sickened individuals to narrow down the origin of the parasite. The CDC and other health agencies are working to determine if a specific crop or region is the primary driver of the current spread.
“"Symptoms can include frequent and sometimes explosive bowel movements."”
The difficulty in culturing Cyclospora cayetanensis creates a systemic vulnerability in the U.S. food supply chain. Unlike bacteria such as Salmonella or E. coli, which can be grown and identified quickly in a lab, this parasite's resistance to cultivation hinders the ability of the CDC to pinpoint contaminated sources. This means the outbreak may persist longer than typical food-borne illnesses because officials cannot easily verify the source through traditional testing methods.
