If you’ve been following the news recently, you’ve probably heard about the Cyclospora outbreak linked to fresh produce. As someone who has studied foodborne bacteria like E. coli and Salmonella throughout my biology courses, I was immediately curious. I did some research on what exactly Cyclospora is and what makes it different from the other microbes responsible for food poisoning.

Cyclospora is a microscopic parasite with a unique life cycle and understanding how it spreads highlights not only the science behind foodborne illness but also why practicing safe eating habits remains so important.

Cyclospora (Cyclospora cayetanensis) is a single-celled parasite that infects the small intestine. Unlike bacteria, which can multiply rapidly under the right conditions, Cyclospora cannot reproduce in food or spread directly from one person to another. Instead, it must first mature in the environment, typically in contaminated soil or water, before it becomes capable of causing infection. Because of this, people usually become sick after eating contaminated food or drinking contaminated water rather than through close contact with someone who is ill.

Fresh produce such as cilantro, basil, lettuce, raspberries, and bagged salad mixes have all been associated with Cyclospora outbreaks. Since these foods are often eaten raw, there is no cooking process to destroy the parasite before consumption.

Once ingested, Cyclospora invades the cells lining the small intestine, disrupting the body’s ability to absorb nutrients and fluids. This leads to inflammation and symptoms that can last much longer than a typical case of food poisoning. Common symptoms include prolonged watery diarrhea, stomach cramps, bloating, nausea, fatigue, loss of appetite, and weight loss. Symptoms usually appear about a week after exposure and can persist for several weeks if left untreated.

As our food supply has become increasingly global, outbreaks like these have become more challenging to prevent. Fresh fruits and vegetables are transported across countries and continents before arriving at grocery stores, creating more opportunities for contamination during growing, harvesting, or processing. If contaminated irrigation water or poor sanitation introduces Cyclospora into the food supply, thousands of servings of produce may be distributed before anyone realizes there is a problem.

This is where public health plays an essential role. Epidemiologists investigate outbreaks by interviewing patients, tracing where contaminated foods originated, and working with laboratories to identify the source. Their work helps remove contaminated products from shelves, issue recalls, and prevent additional illnesses. While these efforts often happen behind the scenes, they are a vital part of keeping our food supply safe.

Although no method can eliminate every risk, practicing safe eating habits significantly reduces your chances of foodborne illness. Always wash fresh fruits and vegetables, including produce with peels that won’t be consumed, under running water before eating them.
Wash your hands before handling food, keep raw meats separate from fresh produce to prevent cross-contamination, clean cutting boards and kitchen surfaces thoroughly, and refrigerate perishable foods promptly. It is also helpful to stay informed about food recalls and public health advisories, especially during outbreak investigations.

One important misconception is that washing produce completely eliminates Cyclospora. While rinsing fruits and vegetables helps remove dirt and many microorganisms, it cannot guarantee the removal of every parasite. Rather than relying on one precaution alone, food safety works best when multiple layers of protection, from farms and food processors to public health agencies and consumers, work together.

The recent Cyclospora outbreak serves as a reminder that food safety extends far beyond our own kitchens. It depends on farmers, distributors, scientists, healthcare professionals, and public health officials working together to identify risks before they become larger problems. While we can’t eliminate every risk, understanding the science behind these outbreaks empowers us to make informed choices. Sometimes the simplest habits, such as washing fresh produce, practicing good kitchen hygiene, and staying informed, are some of the most effective tools we have for protecting both our own health and the health of our communities.