A recent surge in cases of a parasite causing severe diarrhea has been observed among British individuals, particularly those who have recently traveled to Mexico. The UK Health Security Agency (UKHSA) has reported a significant increase in cyclospora infections. Cyclospora is a parasite commonly transmitted through contaminated food items like herbs, salad, and soft fruit.
According to UKHSA, the parasite does not naturally exist in the UK, and there is no risk of person-to-person transmission. The agency has recorded 67 cases across the UK between April 30 and July 15, which represents a notable spike compared to the average annual cases reported between 2022 and 2025.
To prevent infection, UKHSA recommends travelers take necessary precautions, such as maintaining good food and water hygiene practices 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 on their own within a few days, individuals with weakened immune systems may require antibiotics for treatment. Out of the reported cases, 30 were in England, 27 in Scotland, and 10 in Wales. Most affected individuals had traveled to Mexico, with some also visiting the USA.
Ongoing investigations are being conducted to further understand these cases. UKHSA foresees a continued increase in travel-related infections as more people visit Mexico during the summer. Additionally, the agency warns that the outbreak in the USA could contribute to a rise in cases in the UK.
Dr. Philip Veal, a travel health consultant at UKHSA, advises travelers to Mexico and other high-risk areas to follow strict food and water hygiene measures to minimize the risk of infection. If symptoms develop after returning from travel, individuals are urged to seek medical attention and inform healthcare providers of their travel history.
UKHSA is collaborating with ABTA, the travel association, and Mexican health authorities to investigate the escalating cases.