A growing number of UK residents are contracting a parasite leading to severe diarrhea, according to data from the UK Health Security Agency (UKHSA). The agency has observed a significant increase in cyclospora infections among individuals who have recently visited Mexico. Cyclospora, the culprit behind the explosive diarrhea, is typically transmitted through contaminated food, particularly herbs, salad, and soft fruits.
The UKHSA emphasized that cyclospora is not native to the UK and cannot spread from person to person. Between April 30 and July 15, a total of 67 cases have been reported across the UK. To mitigate the risk of infection, the agency is advising all travelers to practice good food and water hygiene while abroad.
Symptoms of cyclospora infection include watery diarrhea, abdominal cramping, bloating, nausea, flatulence, low-grade fever, loss of appetite, and weight loss. While most infections are mild and resolve within a few days without treatment, individuals with weakened immune systems may experience more severe symptoms requiring antibiotic intervention.
Recent data revealed that out of the 67 reported cases in returning travelers, 30 were in England, 27 in Scotland, and 10 in Wales. The number of cases is notably higher than the average of 93 cases recorded annually between 2022 and 2025. Among the cases with travel information available, the majority had visited Mexico, with some also traveling to the USA.
Ongoing investigations by the UKHSA are focused on understanding the spike in cases linked to travel. The agency anticipates a continued increase in travel-related cases, especially as more people visit Mexico during the summer. Travel to the USA, where a similar outbreak has been reported, could also contribute to a rise in cases in the UK.
Dr. Philip Veal, a travel health consultant at UKHSA, highlighted the importance of preventive measures for travelers visiting regions where cyclospora is prevalent. These measures include consuming bottled water, thoroughly cooked food, and avoiding certain foods like fresh uncooked berries and herbs.
UKHSA is collaborating with ABTA, the travel association, and Mexican public health authorities to investigate the rise in cases and provide necessary guidance to travelers.
