UK holidaymakers are being warned about a nasty infectious disease called cyclosporiasis that can cause explosive diarrhoea, after a sharp rise in cases. The UK Health Security Agency (UKHSA), external said 67 cases have been reported since April, with many of them among travellers returning from Mexico. The illness is caused by a parasite, cyclospora, that can contaminate food like salads, herbs and soft fruits. It doesn't naturally occur in the UK and there is no risk of spread from person to person, experts stress. Experts also advise people avoid certain foods such as fresh uncooked berries and herbs, unpeeled fruit and salad items.