UK health authorities have issued a warning to holidaymakers following a sharp rise in cyclosporiasis cases among returning travellers. Between late April and mid-July, 67 cases of the parasitic infection were reported across England, Scotland, and Wales. The UK Health Security Agency (UKHSA) highlighted that the vast majority of cases were linked to travel to Mexico, particularly popular tourist hubs such as Cancún and the Riviera Maya.
Cyclosporiasis is caused by Cyclospora cayetanensis, a microscopic protozoan parasite that does not naturally occur in the UK. It spreads when people consume food or water contaminated with human waste. Outbreaks are frequently traced back to unwashed fresh produce—such as berries, salad leaves, and herbs—served at all-inclusive resort buffets.
The infection causes severe gastrointestinal symptoms, including watery diarrhoea, stomach cramps, nausea, bloating, and prolonged fatigue. While many cases resolve on their own, the infection can persist for weeks without antibiotic treatment. Officials advise UK travellers to adhere strictly to food and water hygiene, choosing freshly cooked, piping-hot meals over raw produce and opting exclusively for bottled water while abroad.
UK medical authorities compared the outbreak to the one seen in the popular game and series “The Last of Us”, but these theories have been debunked.
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