Cyclospora Illness Linked to Contaminated Iceberg Lettuce

Health officials in the U.S. have traced cases of parasitic illness in 15 states to contaminated iceberg lettuce. The Centers for Disease Control and Prevention (CDC) reported that Cyclospora cases have emerged in at least 47 states this year. Investigations are ongoing to determine how many of these cases stem from a common source of contamination.

Recently, the number of states connected to this outbreak rose from nine to 15. Newly affected states include Arkansas, Iowa, Missouri, Nebraska, New Hampshire, and North Carolina. These have joined Illinois, Indiana, Kansas, Kentucky, Michigan, Ohio, Oklahoma, Pennsylvania, and West Virginia in the list of affected regions.

Initial investigations pointed to lettuce served at Taco Bell. Federal officials are now focusing on Taylor Farms as the supplier of the infected lettuce. The company has already recalled iceberg lettuce grown in central Mexico.

Dr. Juan Luis Marquez, a medical director in Michigan, explained that tracing Cyclospora outbreaks is challenging. There are delays between exposure and symptom onset, difficulties in laboratory analysis, and the complexity of interviewing affected individuals to identify common exposures.

Dr. Marquez also mentioned that reductions in public health staffing have decreased the resources available for such investigations. This includes federal, local, and state levels.

Cyclospora is a microscopic parasite that typically causes watery diarrhea with potentially explosive bowel movements. According to the CDC, outbreaks commonly occur in late spring and summer. This heat-loving parasite spreads through feces and affects the bowels.

The illness, cyclosporiasis, is less frequent than other foodborne diseases caused by germs like salmonella and E. coli. Often, cases are never linked to a definite food or source. In 2019, the U.S. recorded its highest number of infections with around 4,700 cases. This year has already exceeded that, with Michigan alone reporting over 12,000 cases, including two fatalities. Across other states, the total number of reported infections is more than 25,000.

The Food and Drug Administration (FDA) is currently monitoring five separate Cyclospora outbreaks. Among them, the 15-state outbreak is the most extensive. None of the other outbreaks have yet been connected to specific products, though one has affected 115 people.