British holidaymakers are being warned about a parasite that can cause severe gastrointestinal illness, including “explosive” diarrhoea, while traveling to holiday destinations. Coverage across outlets advises travellers to take basic food and water precautions to reduce risk. The guidance emphasizes drinking bottled water rather than untreated water sources, and eating food that is thoroughly cooked. Sources also urge people to be alert to symptoms and seek appropriate medical advice if they develop signs of infection during or after their trip. While the reports use strong language about the intensity of diarrhoea, they focus on prevention and awareness rather than confirmed outbreaks. The warning is framed as general travel health advice for people going abroad, particularly where water safety and hygiene standards may vary. No specific country or outbreak details are provided in the supplied material.