Health officials warn of an increase in Cyclospora infections in the UK, with 67 confirmed cases reported since April. Public health surveillance indicates a notable proportion of these infections have been identified in travellers returning from Mexico. The parasite, which causes cyclosporiasis, typically produces prolonged watery diarrhoea and abdominal cramps and can result in severe discomfort for affected individuals.
Symptoms commonly include persistent diarrhoea, nausea, bloating, fatigue and weight loss. Diagnosis requires stool testing for Cyclospora oocysts or molecular testing; clinicians are advised to request appropriate laboratory investigations for patients who present with prolonged gastrointestinal symptoms after international travel. The NHS advises those with severe or persistent diarrhoea following travel to seek medical assessment promptly.
Transmission of Cyclospora occurs via the faecal–oral route, often associated with consumption of contaminated fresh produce or water. Outbreaks have previously been linked to imported fruits, leafy greens and herbs. The standard recommended treatment is the antibiotic combination co‑trimoxazole (trimethoprim–sulfamethoxazole); alternative regimens are considered only when this is contraindicated. Supportive care, including rehydration, is an important component of management.
The UK Health Security Agency and other public health bodies are monitoring case numbers and investigating potential common exposures. Travellers are advised to follow routine food and water safety precautions: wash hands frequently, favour thoroughly cooked foods, avoid drinks with ice of uncertain origin and wash or peel raw produce where possible. Health professionals are reminded to consider cyclosporiasis in the differential diagnosis of persistent diarrhoeal illness after travel.
While many otherwise healthy adults recover with treatment, infections can be prolonged and carry greater risk for young children, older adults and immunocompromised people. Prompt diagnosis and appropriate antibiotic therapy remain the primary measures to reduce symptom duration and limit further transmission.
