Health officials in the United States have reported a parasitic disease outbreak across 15 states linked to lettuce consumption. This year, cyclospora cases have emerged in at least 47 states. Investigations continue to determine how many are connected to a common contaminated source.
The Centers for Disease Control and Prevention (CDC) announced that the number of states affected by this outbreak rose from nine to 15. Newly affected states include Arkansas, Iowa, Missouri, Nebraska, New Hampshire, and North Carolina, joining Illinois, Indiana, Kansas, Kentucky, Michigan, Ohio, Oklahoma, Pennsylvania, and West Virginia.
Initially, investigations focused on lettuce served at Taco Bell. Federal officials have since identified Taylor Farms as a source of the lettuce involved. The company has recalled iceberg lettuce grown in central Mexico.
Dr. Juan Luis Marquez, medical director of health departments in Washtenaw and Livingston counties in Michigan, highlighted challenges in investigating and controlling cyclospora outbreaks. Delays between exposure and symptom development, difficulties with lab analysis, and the extensive work required for interviewing patients complicate efforts. Staff reductions at federal and local health levels further limit resources.
Cyclospora is a microscopic parasite causing diarrhea with frequent, sometimes explosive bowel movements, according to the CDC. Outbreaks are more common in late spring and summer, as the parasite thrives in warm conditions and spreads via feces. Cyclosporiasis, the resulting illness, is less common than foodborne diseases like salmonella and E. coli.
Many cyclosporiasis cases remain unlinked to a specific food source. In 2019, around 4,700 cases were reported, making it the worst year on record. This year, the number has exceeded 25,000 nationwide, with Michigan alone reporting over 12,000 cases, including two deaths.
The U.S. Food and Drug Administration is monitoring five ongoing cyclospora outbreaks, with the one affecting 15 states being the largest. No specific product has been connected to other outbreaks, including one that has sickened 115 people.
The Associated Press Department of Health and Science is supported by the Howard Hughes Medical Institute’s Science Education Department and the Robert Wood Johnson Foundation. AP is solely responsible for this content.