Cyclospora Outbreak Affects Thousands Across Multiple States

As summer heats up, a concerning outbreak of cyclosporiasis, caused by the microscopic parasite Cyclospora, has been reported across the United States, with nearly 7,000 confirmed or suspected cases documented in several states. The Centers for Disease Control and Prevention (CDC) has been tracking this outbreak since May 1, 2026, and the numbers continue to rise, prompting health officials to issue warnings and guidelines for consumers.

What is cyclospora and how does it spread? Cyclospora is a parasite that contaminates fresh produce through contact with human waste and/or contaminated water during growing, harvesting, or processing. Unlike many foodborne illnesses, cyclospora is not typically spread from person to person, as the parasite must mature in the environment before becoming infectious. Symptoms usually manifest about one week after consuming contaminated food, but can appear anywhere from two days to two weeks later. Common symptoms include frequent watery diarrhea, nausea, stomach cramps, fatigue, and low-grade fever. Without treatment, symptoms may persist for several weeks or longer, and some individuals may experience relapsing infections.

Current Situation

• As of July 16, 2026, there have been 1,645 reported cases of cyclosporiasis across 34 states, with 141 hospitalizations.
• Michigan has reported the highest number of cases, exceeding 3,700, followed by Illinois with 216 and Missouri with 43 confirmed infections.
• Florida has documented 50 cases across more than 20 counties, with Lee County leading at nine cases.

Health officials are investigating the source of the outbreak, which has not yet been identified. Investigations into patients' food and travel history are underway to help pinpoint the origin. Past outbreaks have been linked to leafy greens, but officials have not yet confirmed any specific food item associated with the current situation.

Symptoms and Risks

Symptoms of cyclosporiasis can include:

• Frequent watery diarrhea
• Nausea
• Stomach cramps or bloating
• Loss of appetite and weight loss
• Fatigue
• Low-grade fever

Dr. Greg Schrank, an infectious diseases physician at the University of Maryland Medical Center, emphasized the importance of recognizing these symptoms, especially during extreme heat when dehydration can become a serious concern. "What's been quite startling with the current outbreak is the sheer number of cases in a very short period of time," he stated. Symptoms can appear as soon as one day or as late as two weeks after exposure, making it difficult for individuals to connect their illness to specific foods.

Prevention Tips

To reduce the risk of contracting cyclosporiasis, health officials recommend the following practices:

• Wash hands with soap and water for at least 20 seconds before and after handling fresh produce.
• Rinse all fruits and vegetables thoroughly under cool, running water before consumption.
• Gently rub firm produce, such as apples and cucumbers, during rinsing.
• Remove and discard the outer leaves of leafy vegetables, including lettuce and cabbage.
• Use separate cutting boards for fresh produce and raw meats to avoid cross-contamination.
• Avoid prepackaged salads, spinach, or lettuce, and peel outer layers of fruits and vegetables when possible.
• Cook vegetables to at least 158 degrees Fahrenheit to kill the parasite.

Importantly, washing fruits and vegetables does not guarantee the removal of Cyclospora, but it is still an important practice to reduce other contaminants. The CDC has stated that cooking is an effective way to inactivate the parasite.

Seeking Medical Attention

If you experience symptoms of cyclosporiasis, particularly prolonged diarrhea, it is important to seek medical attention. Testing is required for diagnosis, and antibiotics can help clear the infection and reduce the duration and severity of symptoms. Dr. Schrank advises that anyone experiencing symptoms that last more than one or two days should consult a healthcare provider to confirm a diagnosis.

Local Produce and Safety

Concerns about contamination have led many consumers to question the safety of fresh produce, particularly from larger suppliers. Some experts suggest that shopping at local farmers' markets may pose a lower risk due to less handling and a more direct supply chain. For example, Cynthia Yingling of Glenville Hollow Farms noted that customers feel safer purchasing produce that is not washed with potentially contaminated water. "Farmers' markets are a safer choice until they figure out how to take care of it," she remarked.

As health departments continue to investigate the outbreak, consumers are encouraged to stay informed about updates from the CDC and local health authorities. If a specific food item is identified as the source of contamination, public health officials will provide guidance and recall information as necessary.

In light of the current outbreak, it is clear that awareness and proper food handling practices are key to preventing infection. As the situation develops, staying vigilant and informed will help protect you and your family from this persistent parasite.

For the latest updates and information on cyclosporiasis, visit the CDC's cyclosporiasis webpage or your local health department’s resources.