UKHSA publishes data on selected travel-associated infections

Case numbers of selected travel-associated infections reported in England, Wales and Northern Ireland: January to June 2026

The UK Health Security Agency (UKHSA) has published provisional data for England, Wales and Northern Ireland (EWNI) on selected travel-associated infections including mosquito-borne infections (dengue, Zika, chikungunya and malaria) and enteric fever (typhoid and paratyphoid fever) [1].

Between January and June 2026:

• The latest data show a total of 137 cases of dengue were reported in England. South-East Asia and South Asia remain the most common regions for exposure: 27 cases were linked to travel to Thailand and 19 to the Maldives.
• A total of eight Zika virus cases were reported. Indonesia was the most frequently reported country of exposure (four cases). Between 2014 and 2025, only one travel-associated case linked to Indonesia had been reported, which occurred in 2024.
• A total of 59 chikungunya cases were reported, with Sri Lanka being the most commonly reported country of travel (18 cases).
• A total of 557 malaria cases were reported in EWNI from January to May 2026.
• A total of 287 travel-associated enteric fever cases (typhoid and paratyphoid fever) were reported. In recent years, the highest number of enteric fever cases has been recorded between May and October.

See the accompanying news story from the UKHSA 'Travellers reminded to take precautions to avoid infections abroad this summer' for further advice.

For more country-specific information on travel health, visit our Country Information pages and Outbreak Surveillance section.