The Michigan Department of Health and Human Services (MDHHS) reported 3,762 cases of cyclosporiasis as of July 15, marking an increase from the 3,309 cases recorded on July 14. The parasitic intestinal illness, which is linked to contaminated fresh produce, has resulted in 44 hospitalizations according to state health data. Officials continue to investigate potential sources, including lettuce and salad greens, while warning that cases may rise through the end of August.
Geographic Concentration of Cyclospora Cases
The current outbreak is not distributed evenly across the state. According to the MDHHS, the highest concentrations of confirmed illnesses are located in eight specific Michigan counties: Monroe, Lenawee, Washtenaw, Wayne, Shiawassee, Jackson, Oakland, and Livingston. While these areas currently report the bulk of the infections, the Centers for Disease Control and Prevention (CDC) has identified cases in 34 states nationwide.
Did you know?
Cyclosporiasis is caused by a microscopic parasite that infects the small intestine. The Cyclospora parasite is known to be resistant to routine chemical disinfection, making thorough physical cleaning and cooking the most effective defense.
Understanding the Infection and Symptoms
Cyclosporiasis is an intestinal infection caused by a parasite. After exposure, the incubation period typically lasts about one week, though it can range from two days to two weeks or more. Patients often report watery, frequent, and sometimes explosive bowel movements. Other common symptoms identified by the MDHHS include stomach cramps, nausea, persistent fatigue, and a loss of appetite. The illness can be long-lasting, with symptoms persisting for a month or more if left untreated, and relapses are possible.
Risk Reduction and Safe Produce Handling
Because no specific grower or supplier has been identified as the source of this outbreak, health officials recommend a cautious approach to preparing raw produce. The MDHHS advises that cooking greens to at least 158 F (70 C) is the safest method to eliminate the parasite. For raw consumption, officials suggest purchasing whole heads of lettuce rather than pre-washed or bagged kits. Consumers should discard the outer two to three layers of leaves and wash the remaining inner leaves thoroughly under running water.
Guidelines for Specific Produce
- Cilantro and Basil: Separate the leaves and wash them thoroughly under running water. Cooking is recommended for higher-risk individuals.
- Green Onions: Trim the root ends, remove the outer layer, and wash carefully.
- Raspberries: These are difficult to clean due to their textured surface. Cooking them into jams or pies is safer than raw consumption.
- Snow Peas: Rub the surface of the peas while washing under running water.
If you are at higher risk for complications—such as those with weakened immune systems, organ transplant recipients, or the elderly—prioritize cooking all fresh produce.
Food Safety Best Practices
Beyond specific produce advice, the MDHHS emphasizes standard food safety protocols to prevent the spread of the parasite. This includes scrubbing firm fruits like melons and cucumbers with a dedicated produce brush and cutting away any bruised or damaged areas. Surfaces, utensils, and cutting boards must be sanitized before and after food preparation. Refrigeration of cut or peeled produce should happen as soon as possible to prevent further contamination.
Frequently Asked Questions
How is cyclosporiasis diagnosed?
Healthcare providers diagnose the illness through a laboratory test of a stool sample.
Can I get infected with Cyclospora more than once?
Yes, individuals can be infected with the parasite multiple times.
What should I do if I suspect I have the illness?
The MDHHS advises anyone experiencing gastrointestinal symptoms, particularly ongoing diarrhea, to contact their healthcare provider and notify their local health department.
Does freezing kill the parasite?
Freezing may reduce the presence of the parasite, but it does not guarantee its complete elimination. Cooking remains the safest option.
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