New Hampshire Confirms First Two Cases of Cyclosporiasis in 2026

Health officials in New Hampshire have officially confirmed the first two cases of cyclosporiasis in the state for the 2026 season. The New Hampshire Department of Health and Human Services (DHHS) announced the development this week, urging residents to remain vigilant regarding food hygiene and preparation practices as the warm season progresses.

Cyclosporiasis is an intestinal illness caused by the microscopic parasite Cyclospora cayetanensis. Humans become infected by consuming food or water that has been contaminated with the parasite, typically through contact with infected feces. Unlike many other foodborne illnesses, cyclosporiasis is not spread directly from person to person. Because it requires a period of time to become infectious after being shed in a stool sample, the illness is almost exclusively linked to contaminated produce.

The most common symptom of a Cyclospora infection is watery diarrhea, which can sometimes be severe. Other common symptoms include loss of appetite, weight loss, stomach cramps or pain, bloating, increased gas, nausea, and fatigue. Some individuals may also experience low-grade fever or vomiting. Symptoms typically begin about one week after the ingestion of the contaminated food or water, though the onset can range from a few days to several weeks. If left untreated, the symptoms can persist for several weeks or even months, often characterized by a cycle of improvement followed by a recurrence of symptoms.

While the NH DHHS has not yet identified the specific source of the outbreak associated with these two cases, the parasite is frequently linked to imported fresh produce, such as cilantro, basil, lettuce, and raspberries. In previous years, outbreaks have been tied to contaminated berries or leafy greens served in restaurants or purchased at grocery stores. Health officials emphasize that simple washing is not always sufficient to remove the parasite, as it can be protected by the crevices and texture of certain fruits and vegetables.

To reduce the risk of infection, public health experts recommend washing fresh produce thoroughly under running water, although this does not guarantee the removal of all parasites. Cooking produce is the most effective way to kill the parasite. Consumers should also avoid cross-contamination in the kitchen by using separate cutting boards for raw produce and meats. Practicing good hygiene, including regular hand washing, remains a cornerstone of preventing foodborne illnesses.

State epidemiologists are currently working to investigate the travel history and dietary patterns of the two infected individuals to determine if there is a common link between them or a specific food item that may have been distributed across the state. By gathering this data, the DHHS hopes to alert the public if a specific product recall is necessary. Residents who suspect they may have contracted the illness after eating specific produce are encouraged to contact their local health department or healthcare provider.

Public health officials remind the community that while most people recover without complications, it is important to stay hydrated if symptoms occur. Dehydration can be a serious risk, especially for young children, the elderly, and those with weakened immune systems. The DHHS will continue to monitor the situation closely and provide updates as more information regarding the source of these infections becomes available.

Consult a healthcare professional.