UK Sees Sharp Rise in Cyclospora Cases Linked to Mexico Travel

British health authorities are warning holidaymakers about a sharp rise in Cyclospora cayetanensis infections, a parasitic illness that causes severe, explosive diarrhoea, stomach cramps and fatigue. The UK Health Security Agency (UKHSA) has recorded 67 confirmed cases since April, a significant spike compared to typical years.

Link to Mexico

The majority of the cases have been traced to travellers returning from Mexico, a popular summer holiday destination. The parasite is typically transmitted through contaminated food and water — particularly fresh produce such as raspberries, herbs and salad leaves. Tourists are advised to avoid tap water, ice made from tap water, and raw produce that cannot be peeled.

Symptoms and Treatment

Cyclospora infection can begin days or even weeks after exposure. Common symptoms include watery, sometimes explosive diarrhoea, nausea, appetite loss and prolonged fatigue. The illness can last weeks if untreated. Antibiotic treatment with trimethoprim-sulfamethoxazole is effective when diagnosed early. Travellers experiencing gastrointestinal symptoms after returning from affected regions are advised to seek medical attention promptly.

Advice for Travellers

The UKHSA is urging anyone who visited Mexico — or other high-risk destinations — and experiences prolonged diarrhoea after returning to contact their GP and mention their travel history. Standard hand hygiene, food safety practices, and consuming bottled or boiled water significantly reduce risk.