Cyclosporiasis is a parasitic infection of the small intestine caused by the protozoa Cyclospora cayetanensis. People contract cyclosporiasis by consuming contaminated food or water. In 1999, the CDC made cyclosporiasis a nationally reportable disease in the United States. Incidence of cyclosporiasis in the United States and other industrialized nations has increased significantly since it was discovered in 1979, likely due to the expanding availability of imported produce.
Symptoms of cyclosporiasis begin two to 11 days after infection. The most common symptom is frequent, watery diarrhea, but it can also manifest as alternating periods of diarrhea and constipation. Other symptoms include loss of appetite, bloating, flatulence, stomach cramps, nausea and vomiting, headaches, muscle aches, fever, fatigue, and weight loss. Symptoms can last up to four weeks. In some individuals, however, cyclospora infections are asymptomatic.
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