Health authorities in the UK report an increase in cases of a parasitic infection associated with severe, “explosive” diarrhoea. Multiple reports say the warning follows a noticeable rise in infections among people who have recently returned from holiday destinations, with travel to Mexico identified as a contributing factor. The infection is described as parasitic and can lead to acute gastrointestinal symptoms, prompting public health concern about the spread and timing of cases. Outlets characterise the development as an “alarming surge,” citing health chiefs’ communications to urge awareness of symptoms and appropriate hygiene measures, particularly for travellers and those returning from affected regions. While the reports focus on travel-related links—especially to Mexico—they present the broader issue as a domestic rise in reported infections rather than a specific outbreak tied to a single local event. The information is based on health officials’ warnings and case trends reported by the media, with no additional details provided in the excerpts about exact case counts, geography within the UK, or changes in prevention guidance.