Jump to contentAllNewsSportCultureLifestyleCases of giardiasis in the UK were up 11.4 per cent in 2025 (Getty/iStock)The UK Health Security Agency has reported 6,069 cases of giardiasis in 2025, an 11.4 per cent increase from the previous year and the highest total since 2016. Health officials suggest the rise in cases may be driven by post-pandemic international travel, climate change, and improved diagnostic testing. The parasitic bug causes symptoms such as smelly diarrhoea, stomach cramps, bloating, and weight loss, with untreated cases risking severe complications in vulnerable groups. Giardiasis is spread through contaminated food or water, direct contact with infected people or animals, and sexual transmission, with many cases linked to overseas travel. The UKHSA advises travellers to practise good hand hygiene, drink bottled water, avoid raw food washed in tap water, and abstain from swimming until two weeks after symptoms stop. In fullGiardiasis: UK travellers warned over parasitic stomach bug as cases soarMore bulletinsThank you for registeringPlease refresh the page or navigate to another page on the site to be automatically logged inPlease refresh your browser to be logged in

Cases of a diarrhea causing parasite have reached its highest levels since 2016, health officials have warned.

Giardia infection is spread by consuming contaminated food or water, or through direct contact with infected people or animals