As summer travel peaks, holidaymakers returning from Mexico are being urged to exercise caution due to a significant rise in cyclospora infections, a parasitic illness known to cause severe gastrointestinal distress. The UK Health Security Agency (UKHSA) has reported 67 cases of cyclosporiasis since April 2026, with a notable concentration of cases among those who have visited popular tourist destinations in Mexico.
Surge in Infection Rates
The recent uptick in infections has coincided with an outbreak in the United States, where over 18,000 individuals across 45 states have contracted the parasite. Although the exact source of this outbreak remains unidentified, health officials are closely monitoring the situation. Thankfully, there have been no reported fatalities linked to these cases.
Of the 67 cases reported in the UK, 30 have been documented in England, 27 in Scotland, and 10 in Wales. The majority of those affected were travellers returning from Mexico, particularly from the idyllic coastal areas of Riviera Maya and Cancún. According to the UKHSA, 48 out of 52 individuals with travel histories confirmed their visits to these regions, with many staying in various hotels and indulging in a range of foods as part of all-inclusive packages.
Understanding the Cyclospora Parasite
Cyclospora is a microscopic parasite that can infiltrate food items such as salads, soft fruits, and herbs. It is important to note that this parasite does not exist naturally in the UK, and the risk of person-to-person transmission is virtually non-existent.
Symptoms typically manifest as severe diarrhoea, which can be explosive and frequent—some individuals report needing to use the toilet as many as 20 times a day. Other common symptoms include bloating, abdominal cramps, nausea, and fatigue. While most cases tend to resolve without medical intervention, antibiotics are available for those experiencing severe or prolonged symptoms.
Travel Precautions and Recommendations
As the summer holiday season progresses, the UKHSA anticipates an increase in cyclospora cases linked to travel, particularly to Mexico and potentially the US. Dr Philip Veal from the agency advises that anyone experiencing symptoms after returning from travel should seek medical advice promptly. It is crucial for individuals to inform their healthcare providers of their travel history.
To mitigate the risk of infection while abroad, the UKHSA recommends that travellers adhere to strict food and water hygiene practices. This includes opting for bottled water and ensuring that food is thoroughly cooked, even in high-end all-inclusive resorts. Certain foods, such as fresh uncooked berries and herbs, unpeeled fruits, and salads, should be avoided to reduce the risk of exposure.
Why it Matters
The surge in cyclospora infections serves as a stark reminder of the importance of food safety and hygiene, particularly for those travelling abroad. With the potential for severe gastrointestinal symptoms, the impact of this parasite can significantly disrupt holidays and pose serious health risks. Awareness and proactive measures are essential to safeguard the well-being of travellers, ensuring that vacations remain enjoyable and healthy experiences.