UK holidaymakers are being urged to exercise caution as the number of reported cases of cyclosporiasis, an infection caused by the cyclospora parasite, has surged. The UK Health Security Agency (UKHSA) confirmed 67 cases since April 2026, with a significant proportion linked to travel in Mexico. This alarming trend coincides with a broader outbreak in the United States, which has seen over 18,000 infections across 45 states, although no fatalities have been reported.
Understanding Cyclosporiasis
Cyclospora is a microscopic parasite that can contaminate food items such as salads, herbs, and soft fruits, leading to gastrointestinal distress. Notably, this parasite is not endemic to the UK, and experts affirm that it does not transmit from person to person. The UKHSA reports that from 30 April to 15 July 2026, 30 cases were identified in England, 27 in Scotland, and 10 in Wales. Importantly, of the 52 patients with travel history, 48 had recently visited Mexico, particularly the popular tourist destinations of Riviera Maya and Cancún.
Travel Patterns and Risk Factors
The nature of the outbreak raises concerns regarding food safety in all-inclusive resorts, where guests reported consuming a variety of food and beverages. The UKHSA has initiated investigations to trace the source of the infections while monitoring the situation closely. Health authorities recommend that travellers remain vigilant about food and water hygiene, especially in areas where the risk of contamination is heightened. Recommendations include drinking bottled water and avoiding raw foods such as fresh berries, herbs, and unpeeled fruits.
Symptoms and Treatment
The primary symptom of cyclosporiasis is severe watery diarrhoea, which can lead to frequent bathroom visits—up to 20 times a day in some cases. Nick Palmiter, a 29-year-old from Michigan, described the sensation as feeling like “a balloon in your stomach”. While many cases resolve independently, antibiotics are available for those experiencing severe or prolonged symptoms. The UKHSA has cautioned that the ongoing summer travel season may lead to an increase in cases, particularly among those returning from Mexico or the US.
Dr. Philip Veal of the UKHSA has urged travellers to seek medical attention if they experience symptoms such as watery diarrhoea, loss of appetite, stomach pain, or nausea after returning from abroad. It’s essential to inform healthcare providers of any recent travel to ensure proper diagnosis and treatment.
Why it Matters
The rise in cyclosporiasis cases highlights the critical need for heightened awareness of food safety practices among holidaymakers. As the summer travel season peaks, the potential for increased infections poses not only personal health risks but also broader public health challenges. By adhering to recommended hygiene measures and staying informed about emerging health threats, travellers can help mitigate the impact of this parasitic infection, ensuring a safer holiday experience.