The UK Health Security Agency (UKHSA) has reported that imported infections linked to overseas travel have surpassed 1,000 cases in England, Wales, and Northern Ireland during the first half of 2026. Health experts are urging holidaymakers to check travel health advice before departing, as summer getaways approach.
Imported infections data for January to June 2026
The UKHSA data, covering January to June 2026 (with malaria data through May), lists 557 malaria cases, 287 cases of enteric fever (typhoid/paratyphoid), 137 dengue cases in England, 59 chikungunya cases, and 8 Zika cases. These illnesses are often mosquito-borne or contracted through contaminated food and water.
Details on key travel-related illnesses
Zika, though usually mild, poses risks for pregnant women or those trying to conceive. Indonesia was the most common exposure country, linked to four of the eight cases, a notable increase from only one travel-associated case from 2014 to 2025. Chikungunya causes sudden fever and joint pain, with Sri Lanka accounting for 18 of the 59 cases. Malaria remains the most dangerous, requiring rapid diagnosis. Enteric fever cases typically rise between May and October, linked to unsafe food and water. Dengue, or “breakbone fever,” often results in severe illness, with Thailand (27 cases) and the Maldives (19 cases) among top exposure destinations.
UKHSA advice for travellers
Dr Hilary Kirkbride, consultant epidemiologist and head of travel health at UKHSA, stated: “Summer is a popular time to travel – don’t let illness spoil your holidays. Good preparation and planning is important for a safe and enjoyable trip. Check the TravelHealthPro website for the latest health advice for your destination, including which vaccines you may need and any important medications, such as antimalarial tablets. To protect against mosquito borne infections use insect repellent, cover exposed skin and sleep under a treated bed net where needed. For enteric fever and other stomach bugs make sure you take good food and water hygiene precautions. Even if you have visited a country before, you do not have the same level of natural protection against infections as permanent residents, so it is important to take precautions every time you travel. And if you are pregnant or trying to conceive there are special precautions you should take, so please speak to a doctor, nurse or local travel clinic before planning your trip.”
