CDC Investigates Cyclospora Outbreak Across 18 US States

The US Centers for Disease Control and Prevention (CDC) is investigating a parasitic illness, cyclosporiasis, that has led to more than 400 reported cases across 18 states. The illness is caused by the parasite Cyclospora, which contaminates raw produce and water through human feces. Symptoms of cyclosporiasis include cramps, nausea, fatigue, loss of appetite, low-grade fever, vomiting, and notably, frequent and "explosive" watery diarrhea.

The CDC's investigation aims to identify the specific source of the contamination, which is often linked to fresh produce consumed raw. Cyclospora cayetanensis, the parasite responsible, is a single-celled organism that infects the small intestine. Infection typically occurs after consuming food or water contaminated with the parasite's oocysts, which are shed in the feces of an infected person. The incubation period can range from a few days to over a week, and symptoms can persist for weeks or even months if left untreated.

While the CDC has not yet identified a single common source for this particular outbreak, past outbreaks have been linked to various types of produce such as basil, cilantro, berries, and pre-packaged salads. Public health officials are urging consumers to practice good hygiene, including thorough handwashing before and after handling food, and to wash all produce carefully, especially items that will be eaten raw. The agency is working with state and local health departments to track the spread of the illness and to implement control measures to prevent further infections.