A fast-moving parasite, Cyclospora, is causing an intestinal illness known as cyclosporiasis and has sickened thousands of Americans in more than 30 states. The outbreak typically prompts symptoms such as watery or explosive diarrhea, stomach cramps, bloating, and increased gas.

Michigan has reported the highest number of cases, with over 1,500 infections logged as of July 10. More than a dozen hospitalizations have occurred since the outbreak began, and symptoms can persist for weeks if left untreated.

While Cyclospora is more common in tropical and subtropical areas, domestic foodborne outbreaks linked to imported produce are an annual occurrence in the United States. State and federal agencies are currently conducting traceback investigations to identify the sources of contamination.

To mitigate the risk of infection, public health guidelines recommend several food safety practices. Consumers are advised to avoid pre-cut salad kits and bagged salad mixes due to a higher risk of cross-contamination. Instead, opt for whole heads of lettuce and intact herbs. It is also recommended to remove and discard the outer two to three leaves of leafy greens before preparation. All fresh produce, including berries, cilantro, and basil, should be rinsed thoroughly under pressurized tap water, not just soaked in a bowl.

For firm produce like melons, cucumbers, and tomatoes, scrubbing the rinds under running water with a clean brush before cutting is advised. Cooking vegetables whenever possible is the most reliable method to destroy the Cyclospora organism. Additionally, sanitizing kitchen tools such as cutting boards, knives, and countertops with hot, soapy water after handling raw fruits and vegetables is crucial to prevent cross-contamination.

Previous seasonal outbreaks in the U.S. have been linked to imported produce such as basil, cilantro, mesclun lettuce, raspberries, and snow peas. The Centers for Disease Control and Prevention (CDC) designates May 1 through August 31 as peak cyclosporiasis season, a period when case counts naturally tend to rise.