A massive outbreak of cyclosporiasis, an intestinal infection caused by the parasite *Cyclospora cayetanensis*, is currently sweeping across the United States. With nearly 7,000 confirmed and probable cases reported, health experts anticipate this will be the largest outbreak of the illness in U.S. history. The Centers for Disease Control and Prevention (CDC) has confirmed 1,645 cases across 34 states, with over 5,100 additional cases currently under investigation. While the parasite typically causes annual summer surges, the current numbers significantly exceed the approximately 3,000 cases recorded in previous years.
Source Identified: Shredded Lettuce
Public health authorities have identified shredded iceberg lettuce served at Taco Bell locations in five states—Michigan, Indiana, Ohio, Kentucky, and West Virginia—as a source of the outbreak. More than 1,644 individuals who fell ill reported eating at Taco Bell locations within these states. The implicated lettuce was supplied by Taylor Fresh Foods. In a July 17 statement, the company announced a recall of all iceberg lettuce products sourced from central Mexico, noting that the FDA traceback investigation pointed to a specific independent farm. While that farm represents less than 1% of the U.S. iceberg lettuce supply, Taylor Fresh Foods has removed all lettuce from that region indefinitely. Taco Bell confirmed on July 17 that it had removed all affected lettuce from its restaurants. An additional batch of shredded iceberg lettuce, not included in the initial recall, also tested positive for the parasite during the FDA investigation. It remains unclear if produce from the same supplier is linked to outbreaks in other states.
For more on this story, see Taco Bell Lettuce Linked to Multistate Cyclosporiasis Parasite Outbreak.
Understanding Cyclosporiasis
Cyclosporiasis is a gastrointestinal illness transmitted through the ingestion of food or water contaminated with the parasite’s oocysts—a resistant form of the parasite that survives outside the body. According to Azadeh Nasuhidehnavi, an infectious disease expert at Binghamton University, symptoms typically appear 7 to 10 days after exposure and include:
- Watery, often explosive diarrhea
- Cramping and nausea
- Fatigue
- Occasional low-grade fever
If left untreated, the illness can last approximately two weeks. While rarely life-threatening, it can lead to hospitalization due to severe dehydration.
This follows our earlier report, Taylor Farms Lettuce Identified as Potential Source of Taco Bell Outbreak.
Risk Factors and Vulnerable Populations
While healthy adults often experience a self-limited illness, certain groups are at higher risk for more severe or prolonged symptoms. These include infants and young children, whose immune systems are still developing, and the elderly, whose natural defenses may wane. Individuals with compromised immune systems—such as cancer patients on chemotherapy, transplant recipients, dialysis patients, and those living with HIV/AIDS—face a substantially higher risk of severe infection. Health officials are urging clinicians to maintain a high index of suspicion for these groups as the investigation continues.
A Strained Public Health Response
The record-breaking outbreak is occurring against a backdrop of significant shifts in public health infrastructure. Michigan, the state hardest hit by the current outbreak, has reported 3,309 cases, far exceeding its typical annual average of 40 to 50 cases. State and local health departments have faced challenges following recent funding cuts and staff losses. Federal agencies, including the CDC, have also experienced significant staff turnover.
Read also: Taylor Farms Recalls Iceberg Lettuce in 27 States Over Cyclospora Outbreak.
Prevention and Safety
As authorities work to trace the source of the outbreak, the CDC and food safety experts recommend the following precautions:
- Hand Hygiene: Wash hands thoroughly with soap and water before and after preparing raw fruits and vegetables.
- Produce Preparation: Wash all produce thoroughly. Scrub firm fruits and vegetables with a clean brush.
- Selection: Food safety specialists have suggested that consumers may opt for heads of lettuce rather than pre-bagged salad mixes to reduce risk.
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