If you ever wanted a good excuse for skipping out on the fresh salad for lunch, here’s one. Reports of cyclosporiasis, a foodborne parasitic disease that can cause explosive bouts of diarrhea, are skyrocketing in several parts of the country, and federal health officials are finally sounding the alarm about it after weeks of media reports. As of Wednesday, thousands of cyclosporiasis cases have been reported recently in more than 30 states. The true toll is likely higher, however, and it’s taken weeks for the Centers for the Disease Control and Prevention to formally acknowledge the possibility of a connected outbreak in multiple Midwestern states. No specific food source linked to these cases has been identified as of yet, though local health officials have singled out lettuce or salad greens as potential culprits to avoid for residents in these hot spots. A delayed alert Cyclosporiasis is caused by various species of the microscopic parasite Cyclospora, predominantly Cyclospora cayatenensis. Though rarely life-threatening, the disease is infamous for causing watery and explosively loud bouts of diarrhea, along with other common symptoms of gastrointestinal illness.
Cyclosporiasis is endemic to tropical and subtropical parts of the world, and stateside cases tend to be traced back to imported food from these areas (particularly produce) or to people who initially caught the disease while traveling in these endemic regions. The incidence of cyclosporiasis seems to be increasing worldwide, however, and 2026 is gearing up to be an especially bad year for it in the U.S.
