Parasitic Illness Outbreak in Michigan Linked to Salad Greens

In Michigan, health officials from the Michigan Department of Health and Human Services (MDHHS) report a parasitic illness outbreak that may be associated with lettuce or salad greens. Although a specific produce item, grower, or supplier has yet to be identified, investigations suggest a link to these greens.

Dr. Natasha Bagdasarian, MDHHS Chief Medical Executive, stated that although a definitive source is not yet confirmed, early findings indicate that lettuce frequently appears in the investigation. She encouraged residents to take precautionary measures to safeguard their families.

To reduce the risk of infection, officials advise purchasing whole heads of lettuce. Discard the outer two to three layers of leaves and thoroughly wash the inner leaves. For greens that can be cooked, ensure they reach a temperature of at least 158 degrees.

Typically, Michigan records around 50 cases of cyclosporiasis annually. However, a significant outbreak beginning in late June has resulted in 2,640 cases across the state, with over 40 hospitalizations. Similar cases have also been reported nationwide.

Dr. Ambreen Malik, an infectious disease expert at the University of Michigan Health Sparrow, highlights the difficulties in tracing the outbreak’s source. The extended incubation period of one to two weeks and the extensive food distribution network complicate identifying the specific produce involved.

The parasite Cyclospora cayetanensis causes cyclosporiasis. Infection typically occurs through food or water tainted with feces; it does not usually spread person to person. The Centers for Disease Control and Prevention (CDC) associates American foodborne outbreaks with fresh produce like basil, cilantro, and raspberries.

Symptoms of cyclosporiasis can include watery diarrhea with frequent and sometimes severe bowel movements, appetite loss, abdominal cramps, bloating, nausea, vomiting, and low-grade fever. Anyone experiencing these symptoms should consult a healthcare provider promptly. Diagnosis involves a stool sample, and antibiotic treatment is available.

Officials emphasize the importance of thoroughly washing fruits and vegetables under running water before consumption, cutting, or cooking. Firm produce should be scrubbed with a clean brush, and damaged areas should be removed before preparation. Refrigerate any cut, peeled, or cooked produce as soon as possible.