Roy Suryo
UK holidaymakers are being warned about a nasty infectious disease called cyclosporiasis that can cause explosive diarrhoea, after a sharp rise in cases. The UK Health Security Agency (UKHSA) has reported 67 cases since April, with a significant number of these linked to travellers returning from Mexico. This surge in the UK mirrors a widespread outbreak in the United States, where over 18,000 individuals across 45 states have been infected. While the specific source of the outbreak remains elusive, no fatalities have been reported in connection with the illness.
Cyclosporiasis is an intestinal illness caused by the microscopic parasite Cyclospora cayetanensis. This parasite thrives in warm, humid environments and is typically transmitted through the consumption of contaminated food or water. Common culprits include fresh produce such as salads, herbs, and soft fruits, which may have been irrigated with or washed in contaminated water. Crucially, Cyclospora does not naturally occur in the UK, and experts emphasize that it does not spread from person to person, mitigating concerns about local transmission within the UK population.
The UKHSA’s data reveals a clear pattern in recent infections. Between April 30 and July 15, 2026, a total of 67 cases were recorded: 30 in England, 27 in Scotland, and 10 in Wales. Of these, 52 individuals provided travel history, with an overwhelming 48 reporting recent travel to Mexico. Many of these travellers specifically mentioned stays in the popular white sand beach resort area of Riviera Maya, or slightly further north in the coastal city of Cancún. The affected individuals reported staying in a variety of accommodation types, from luxury all-inclusive resorts to more modest establishments, and consumed a diverse range of food and beverages as part of their holiday packages. The UKHSA is actively investigating and monitoring the evolving situation to identify any commonalities in the food or water sources that may be contributing to the infections.
The symptoms of cyclosporiasis can be severe and debilitating, significantly impacting an individual’s quality of life. The most prominent and distressing symptom is frequent, watery diarrhoea, which can be explosive in nature. Sufferers have described needing to use the toilet as many as 20 times a day, leading to significant dehydration and exhaustion. Beyond the gastrointestinal distress, other common symptoms include loss of appetite, significant weight loss, persistent stomach cramps or pain, bloating, increased flatulence, nausea, and profound fatigue, often accompanied by flu-like symptoms. These symptoms can manifest anywhere from a few days to over a week after ingesting the contaminated parasite, and can persist for weeks if left untreated.
The outbreak in the US has provided a stark illustration of the potential scale of this infection. With over 18,000 cases reported, the sheer volume of infections has put a strain on healthcare resources and public health agencies. The experience of individuals like Nick Palmiter, a 29-year-old from Michigan, highlights the physical discomfort and psychological toll of the illness. Palmiter described a sensation of constant pressure and "bubbling" in his stomach, likening it to having a balloon inside him. While most cases of cyclosporiasis eventually resolve on their own with supportive care, severe or prolonged infections may require antibiotic treatment.
Given the current epidemiological trends, the UKHSA anticipates a further increase in cases as the summer travel season intensifies. Mexico remains a primary concern due to the high number of reported infections linked to the country, but the US also presents a potential risk, particularly for travellers who may have been exposed to contaminated produce. The agency is urging individuals planning to travel to these destinations to be vigilant and proactive in their self-protection measures.
To mitigate the risk of contracting cyclosporiasis, travellers are strongly advised to adhere to robust food and water hygiene practices, even when staying in seemingly high-end, all-inclusive resorts. This includes exclusively drinking bottled water, and ensuring that all food is thoroughly cooked before consumption. Special attention should be paid to avoiding certain high-risk foods. These include fresh, uncooked berries and herbs, which are notoriously difficult to thoroughly wash and can harbour the parasite. Unpeeled fruits and raw salad items also pose a significant risk, as the parasite can be present on the surface and may not be eliminated by simple rinsing. Washing hands frequently with soap and water, especially before eating and after using the toilet, is also a critical preventive measure.
Public health officials are working diligently to identify the specific sources of contamination. Investigations are ongoing to pinpoint the exact foods or water supplies responsible for the current outbreaks in both the US and the UK. This often involves detailed epidemiological studies, traceback investigations of food products, and environmental sampling. The goal is to prevent further spread and to implement targeted interventions to protect the public.
Dr. Philip Veal from the UKHSA issued a clear advisory for returning travellers. He urged anyone who develops symptoms after travel, such as watery diarrhoea, loss of appetite, weight loss, stomach cramps or pain, bloating, increased wind, nausea, fatigue, or other flu-like symptoms, to seek prompt medical attention. Crucially, he emphasized the importance of informing their healthcare professional about their recent travel history. This information is vital for accurate diagnosis and appropriate treatment, as symptoms of cyclosporiasis can sometimes be mistaken for other gastrointestinal illnesses. Early detection and intervention are key to managing the infection and preventing potential complications. The UKHSA will continue to monitor the situation closely and provide updated guidance as necessary to protect the health of UK residents. The collective efforts of public health agencies, healthcare providers, and informed travellers are essential in managing and ultimately overcoming this challenging parasitic infection.
Nana Banana
Ramos Leo
Nakalama John
