Health officials in the United States are investigating a growing outbreak of cyclosporiasis, a parasitic infection that causes severe watery, sometimes “explosive,” diarrhoea. The illness has been reported in more than 30 states, with Michigan recording the highest number of cases as authorities work to identify the source.
The infection is caused by the microscopic parasite Cyclospora cayetanensis, which is typically spread through food or water contaminated with human waste. Investigators believe contaminated fresh produce, including lettuce and other leafy greens, may be linked to the outbreak, although the exact source has not yet been confirmed.
Symptoms usually appear about a week after exposure and include prolonged watery diarrhoea, stomach cramps, nausea, bloating, fatigue, loss of appetite and, in some cases, vomiting or a low-grade fever. Without treatment, the illness can last for several weeks and may come and go.
While the infection is rarely life-threatening, health experts warn that dehydration can become serious, particularly for older adults, young children and people with weakened immune systems. Antibiotics are commonly used to treat confirmed cases.
The US Centers for Disease Control and Prevention (CDC), along with state health departments and the Food and Drug Administration (FDA), is continuing to trace the outbreak. Officials advise the public to thoroughly wash fresh produce, maintain good kitchen hygiene and seek medical attention if severe or persistent diarrhoea develops.
