Cyclospora Outbreak Linked to Iceberg Lettuce Affects 15 States

Health officials in the U.S. have linked parasitic illness cases to iceberg lettuce in 15 states. The Centers for Disease Control and Prevention (CDC) reported an increase from nine to 15 states involved in this outbreak of cyclospora-related illnesses. 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.

This year, cyclospora cases have been reported in at least 47 states. Investigators are determining how many cases can be traced to a common contaminated source. Initially, lettuce from Taco Bell was under scrutiny. Federal officials now focus on Taylor Farms, which has recalled iceberg lettuce produced in central Mexico.

Dr. Juan Luis Marquez, medical director of health departments in Michigan, notes several challenges in investigating cyclospora outbreaks. These include delayed symptom onset, difficulties in laboratory analysis, and the extensive effort required to interview affected individuals. Additionally, staffing cuts across federal, state, and local public health levels have reduced available resources, affecting response capacity.

Cyclospora is a microscopic parasite that often causes watery diarrhea and explosive bowel movements. According to the CDC, outbreaks are more frequent in late spring and summer, as the parasite thrives in warmer temperatures and spreads through feces. Compared to illnesses like salmonella and E. coli, cyclosporiasis is less common and often remains unlinked to a specific food source.

In 2019, the U.S. experienced its worst year for cyclospora infections, with approximately 4,700 cases reported nationwide. However, this year has far exceeded those numbers. Michigan alone has reported over 12,000 cases and two deaths, while the national total stands at over 25,000 infections.

The Food and Drug Administration (FDA) is monitoring five separate cyclospora outbreaks. The 15-state iceberg lettuce-related outbreak remains the largest. No specific products have been identified in relation to other ongoing outbreaks, including one affecting 115 individuals.

The Associated Press Health and Science Department acknowledges support from the Howard Hughes Medical Institute’s Department of Science Education and the Robert Wood Johnson Foundation. The AP maintains sole responsibility for the content provided.