Cyclosporiasis Outbreaks Linked to Contaminated Produce

Cyclosporiasis outbreaks have been reported across the United States, with health officials investigating the source of contamination. Professor Kali Kniel of the University of Delaware's Department of Animal and Food Sciences, who specializes in microbial food safety, explained in an interview with NPR's Mary Louise Kelly that these outbreaks are frequently associated with contaminated produce. Cyclosporiasis is an intestinal illness caused by the microscopic parasite Cyclospora cayetanensis.

The parasite is typically transmitted to humans through contaminated food or water. Common sources of infection include fresh produce such as basil, cilantro, mint, berries, and pre-packaged salads. The outbreaks often occur during warmer months when consumption of fresh fruits and vegetables is higher. Symptoms of cyclosporiasis can include watery diarrhea, loss of appetite, weight loss, cramping, bloating, gas, nausea, and fatigue. Some individuals may also experience vomiting and a low-grade fever.

Professor Kniel emphasized the critical importance of proper food handling and hygiene to prevent the spread of Cyclospora. Washing hands thoroughly with soap and water before and after handling food is a primary defense. Additionally, all fresh produce should be washed thoroughly under running water before consumption, even if it is to be peeled. This includes fruits and vegetables that are not typically eaten raw, as the parasite can be transferred from the outside to the inside during preparation.

Public health agencies, such as the Centers for Disease Control and Prevention (CDC), monitor for cyclosporiasis cases and investigate potential foodborne sources. When an outbreak is identified, these agencies work to pinpoint the specific food item and geographic region involved to issue warnings and prevent further infections. The CDC recommends that individuals who have recently traveled to regions where cyclosporiasis is endemic also take precautions, as imported produce can sometimes be the source of contamination in non-endemic areas. Treatment for cyclosporiasis typically involves antibiotics, but prevention through diligent hygiene practices remains the most effective strategy.