The UK Health Security Agency (UKHSA) has warned British tourists of a surge in cases of cyclosporiasis, a parasitic infection causing 'explosive diarrhoea', linked to travel to Mexico. Since April, 67 cases have been reported across the UK, with the majority involving holidaymakers returning from Mexican resorts.
Outbreak details and affected regions
Of the 52 cases with travel information, 48 reported recent travel to Mexico, many staying in the Riviera Maya or Cancún areas. The UKHSA noted that those affected stayed in 'a range of different hotels' and consumed food and drink as part of all-inclusive packages. The agency is collaborating with Mexican public health authorities to trace the source.
Cyclospora cayetanensis and transmission
The parasite Cyclospora cayetanensis infects the small intestine and contaminates fresh produce like salads, herbs, and soft fruits. It is not typically spread person-to-person and does not occur naturally in the UK. In the last four months, 30 cases were reported in England, 27 in Scotland, and 10 in Wales.
Symptoms and treatment
Symptoms include frequent watery diarrhoea, abdominal cramping, bloating, nausea, flatulence, low-grade fever, loss of appetite, and weight loss. While most cases are mild and resolve without treatment, immunocompromised individuals may require antibiotics.
Travel advice from UKHSA
Dr Philip Veal, Consultant in Travel Health at UKHSA, advised: 'Travellers to Mexico and other areas where the infection is more common can reduce their risk by following good food and water hygiene measures, including drinking bottled water and eating thoroughly cooked food, even when staying in high-end all-inclusive resorts.' He also recommended avoiding fresh uncooked berries and herbs, unpeeled fruit, and salad items. Tourists experiencing symptoms after return should seek medical attention and inform healthcare professionals of their travel history.
US outbreak context
The infection has also spread across the United States, with over 18,000 cases reported in 45 states, though no deaths have been recorded. The origin of the outbreak remains largely unknown due to difficulties in tracing the parasite.
