Cyclosporiasis cases rise in Maryland and Virginia

A parasitic foodborne illness has caused 843 illnesses and 86 hospitalizations nationwide as of July 9, according to the Centers for Disease Control and Prevention. No deaths have been reported. The illness is caused by the microscopic parasite Cyclospora cayetanensis. Symptoms include watery diarrhea, loss of appetite, weight loss, stomach cramps, bloating, nausea, and fatigue.

Transmission and prevention Health officials state the parasite spreads when infected feces contaminate food or water. Direct person-to-person transmission is unlikely because the parasite requires days to weeks to become infectious. Prevention measures include washing produce, avoiding untreated water, avoiding contact with human or animal feces, and washing hands after using the toilet or changing diapers.

Regional case counts As of July 13, the District of Columbia Department of Health has reported no cases. Maryland has recorded up to 32 infections since May 1, nearly double the 19 cases reported during the same period in 2024 and the 18 cases in 2025.

Virginia has reported between 11 and 30 cases since May 1, with the Fairfax County Health Department confirming 10 infections as of July 8. The CDC has asked states for weekly case updates due to the increase. The outbreak has been linked to raspberries, basil, cilantro, snow peas, and mesclun lettuce.

The illness can be treated with antibiotics but may last a month or longer if untreated.