The CDC has confirmed 145 cases of cyclosporiasis across 17 states, prompting an investigation into the source of a parasite causing severe gastrointestinal illness.
Federal health officials are investigating a growing outbreak of cyclosporiasis, a gastrointestinal illness caused by the microscopic parasite Cyclospora. As of mid-June 2026, the Centers for Disease Control and Prevention (CDC) has confirmed 145 cases across 17 states, with 20 patients hospitalized.
The hallmark symptom of cyclosporiasis is watery, often “explosive” diarrhea, which can persist for weeks or even months if left untreated. Other symptoms include severe abdominal cramping, bloating, nausea, fatigue, and significant weight loss. The official outbreak season for this parasite runs from May 1 through August 31, a period during which warmer temperatures typically lead to an increase in infections.
Cases have been reported in a wide range of states, from Texas to Alaska. New York has been particularly affected, with reports of between 31 and 80 cases. Texas and Illinois follow, each reporting between 11 and 30 cases.
While some infections may resolve on their own, many cases require antibiotic treatment. Among the 145 confirmed cases, 20 individuals have needed hospitalization, although no deaths have been reported. The patients range in age from 5 to 86 years, with a median age of 42. Notably, women account for 61% of the reported cases.
The CDC, in collaboration with the Food and Drug Administration and state health officials, is actively investigating multiple clusters of cases. However, they have not yet identified a common source for the infections. “There is currently no evidence of a single, multistate Cyclospora outbreak linking all cases,” the CDC stated in its surveillance report.
For those experiencing symptoms of cyclosporiasis, the CDC advises contacting a healthcare provider for testing and appropriate treatment.
According to Fox News, the investigation into the outbreak is ongoing as health officials work to pinpoint the source of the infections.