A multistate outbreak of cyclosporiasis, a diarrheal illness caused by the microscopic parasite Cyclospora, has prompted an investigation by the U.S. Centers for Disease Control and Prevention (CDC). Since the beginning of May, health officials have identified numerous cases across several states, with New York reporting one of the highest numbers. Investigators are working to determine the common food source responsible for the outbreak.

Cyclospora infection can cause watery diarrhea, loss of appetite, stomach cramps, bloating, nausea, fatigue, and weight loss. According to the CDC, the reported cases involved people who had eaten food before becoming sick and had not traveled internationally during the two weeks prior to their illness. Patients have ranged from children to older adults, and while some required hospitalization, no deaths have been reported.

Health officials believe the actual number of infections may be higher than reported because many mild cases are never diagnosed. Additional cases have also been identified in several other states, including New Jersey, Florida, Pennsylvania, Texas, Virginia, and others, suggesting the outbreak may be linked to a widely distributed food item.

The CDC continues to investigate the source of the outbreak. Cyclospora is a parasite—not a bacterium—and it typically spreads through food or water contaminated with human feces. Fresh produce such as leafy greens, herbs, and berries has been linked to previous outbreaks. Health officials recommend washing produce thoroughly, practicing good food hygiene, and seeking medical care if severe or prolonged diarrhea develops.