A growing number of British individuals have been affected by a parasite leading to severe diarrhea outbreaks. Recent data from the UK Health Security Agency (UKHSA) indicates a significant increase in cyclospora infections among individuals who have visited Mexico. Cyclospora, a parasite responsible for causing explosive diarrhea, is commonly transmitted through contaminated food items such as herbs, salad, and soft fruit.
The UKHSA clarified that Cyclospora is not native to the UK, and there is no risk of person-to-person transmission. Between April 30 and July 15, a total of 67 cases have been reported across the UK. To prevent infection, the agency now advises all travelers to practice proper food and water hygiene while abroad. Apart from watery diarrhea, symptoms of cyclospora may include abdominal cramping, bloating, nausea, flatulence, low-grade fever, loss of appetite, and weight loss.
While most infections are mild and resolve without treatment within a few days, individuals with compromised immune systems may experience more severe symptoms requiring antibiotics. Recent data reveals that out of the 67 reported cases among returning travelers, 30 were in England, 27 in Scotland, and 10 in Wales. This surge in cases marks a sharp increase compared to the annual average recorded between 2022 and 2025.
Of the 52 cases with available travel information, 48 individuals had visited Mexico, with one of them also traveling to the United States. Further investigations are ongoing, with expectations of a continued rise in travel-related cases as more people travel to Mexico during the summer. Travel to the USA, where a widespread outbreak has been reported, also poses a potential risk of increasing the number of cases in the UK.
Dr. Philip Veal, a consultant in travel health at UKHSA, emphasized the importance of adhering to good food and water hygiene practices to reduce the risk of cyclospora infections while traveling to Mexico and other high-risk areas. He advised travelers to consume bottled water, thoroughly cooked food, and avoid certain items like fresh uncooked berries, herbs, unpeeled fruit, and salads. If symptoms occur after returning from travel, seeking medical attention and informing healthcare professionals of the travel history is recommended.
UKHSA is collaborating with ABTA, the travel association, and Mexican public health authorities to investigate the rise in cases and implement necessary measures.