Cyclospora Parasite Infection Cases Rise in UK

Health officials in the United Kingdom have issued a warning to travelers after a sharp increase in cases of a parasitic illness known as cyclosporiasis. The disease is caused by a microscopic parasite called Cyclospora and is known for causing severe watery diarrhea and other digestive symptoms.

The UK Health Security Agency (UKHSA) reported that 67 cases have been identified since April 2026. Many of the affected individuals had recently returned from trips to Mexico.

Health authorities are closely monitoring the situation as international travel continues during the busy summer holiday season. Officials expect additional cases may be detected in the coming weeks as more travelers return from overseas destinations.

According to available data, 30 cases have been reported in England, 27 in Scotland, and 10 in Wales between April 30 and July 15. Travel information was available for 52 of the reported cases. Of those, 48 people had recently visited Mexico.

Many travelers reported staying in popular tourist destinations along Mexico’s Caribbean coast. The most frequently mentioned locations included Riviera Maya and Cancún, both known for their beach resorts and all-inclusive holiday packages.

Health investigators found that affected travelers stayed at a variety of hotels and consumed different foods and drinks during their trips. At this stage, authorities have not identified a single source responsible for the infections.

The warning comes as the United States also faces a significant outbreak of the same illness. More than 18,000 cases have been reported across 45 states. Officials have not yet identified the source of the outbreak, and no deaths have been reported.

Cyclospora is a parasite that can contaminate food and water. It is commonly linked to fresh produce, including salads, herbs, berries, and other fruits. The parasite does not naturally occur in the United Kingdom, making most domestic cases travel-related.

Health experts stressed that the infection does not spread directly from person to person. Instead, individuals become infected after consuming contaminated food or water.

The most common symptom is frequent watery diarrhea, which can become severe. Other symptoms may include stomach pain, cramps, bloating, loss of appetite, nausea, fatigue, increased gas, and weight loss.

Some patients have described the illness as extremely uncomfortable. Individuals affected by the infection have reported frequent trips to the bathroom throughout the day due to the persistent nature of the digestive symptoms.

Medical experts say the illness often resolves without treatment. However, some cases may last for several weeks if left untreated. In more severe or prolonged situations, healthcare providers may prescribe antibiotics to help clear the infection.

Public health officials are encouraging travelers to take precautions when visiting destinations where the parasite may be present. Good food and water hygiene remains one of the most effective ways to reduce the risk of infection.

Travelers are advised to drink bottled or properly treated water whenever possible. Eating thoroughly cooked food can also help lower the risk of exposure to harmful parasites and other foodborne illnesses.

Experts recommend avoiding certain uncooked foods that may carry a higher risk of contamination. These include fresh berries, herbs, unpeeled fruits, and raw salad items. Care should be taken even when staying at high-end resorts or participating in all-inclusive holiday programs.

The UKHSA said investigations are ongoing as officials continue to collect information from affected travelers. The agency is working to better understand the source of the infections and determine whether additional public health measures are needed.

Health authorities are also encouraging people to remain alert for symptoms after returning from international travel. Early medical advice can help ensure proper diagnosis and treatment.

Dr. Philip Veal of the UKHSA advised travelers to seek medical attention if symptoms develop after returning home. He said people experiencing watery diarrhea, stomach pain, bloating, loss of appetite, weight loss, nausea, fatigue, or flu-like symptoms should inform healthcare professionals about their recent travel history.

As summer travel continues, health officials are urging holidaymakers to follow food safety guidance and remain aware of potential health risks abroad. Increased awareness and preventive measures may help reduce the number of future infections linked to international travel.