Health officials have reported a notable surge in cyclosporiasis, a parasitic infection causing severe diarrhea, with a significant number of cases linked to travel in Mexico and the U.S. Since May, 67 individuals in England, Wales, and Scotland have fallen ill, a sharp increase compared to the average of 93 cases annually. Of these reported cases, 48 were associated with travel to Mexico, and one patient had also visited the U.S.
In the United States, the Centers for Disease Control and Prevention (CDC) has confirmed nearly 7,000 cases of cyclosporiasis. Michigan has reported over 3,300 cases, with New York State also experiencing a high number of infections. Public health experts believe the U.S. outbreak is likely connected to multiple points of contamination within the food supply.
Cyclosporiasis is caused by the microscopic parasite Cyclospora cayetanensis, which spreads through contaminated food or water. Symptoms include watery, often explosive, diarrhea, loss of appetite, stomach cramps, nausea, fatigue, and flu-like symptoms. While most cases resolve within days to a month, the illness can be prolonged and may require antibiotic treatment, especially for severe or immunocompromised patients.
While cyclosporiasis does not occur naturally in the UK, health authorities are advising travelers to take precautions. Dr. Philip Veal, a consultant in travel health at the UK Health Security Agency (UKHSA), noted the rise in infections among travelers returning from Mexico. The UKHSA is collaborating with Mexican public health authorities to investigate the increase in cases.
Most UK cases have been linked to all-inclusive resorts in the Riviera Maya and Cancún regions of Mexico. The parasite is commonly found in fresh produce like leafy greens, herbs, and berries, which can become contaminated. Health officials recommend that travelers to regions where the infection is prevalent practice good food and water hygiene. This includes drinking bottled water and consuming thoroughly cooked food, even in high-end resorts. Avoiding uncooked berries, unpeeled fruits, and salads is also advised.