Cases of imported dengue recorded across England, Wales, and Northern Ireland have reached their highest levels since the surveillance of the mosquito-borne virus began.
According to new data from the UK Health Security Agency, 904 dengue cases were recorded in returning travellers in 2024, almost 45% higher than the previous year.
The UKHSA data found that all cases were linked to people travelling from abroad, predominantly in Southern and Southeastern Asia.
The findings come as the Whole Health Organization continues to monitor increasing cases of Dengue, a virus that has been rising globally since at least 2010.
Dengue fever is an infection spread among humans by infected mosquitos, commonly found in many warmer parts of the world. It’s not found in the UK and cannot be passed between people.
However, according to the NHS, there are also risks of dengue fever being contracted in Europe during the warmer months, including Croatia, France, Italy, and Spain. Changing environmental factors are also influencing where these mosquitos are spreading to.
In most cases, the virus doesn’t pose a serious threat but can result in severe fever and vomiting. In some rare instances, it can be fatal —over 8500 deaths were recorded globally in 2024.
According to the latest UKHSA data, dengue continues to be the most frequently reported infection among a number of travel-related illnesses, including Zika and cholera. However, there are simple steps that travellers can take to reduce their risk of exposure.
Dr Philip Veal, a consultant in Public Health at the UK Health Security Agency, is encouraging travellers to take extra precautions when it comes to mosquito-borne infections.
“It is essential to take precautions against mosquito-borne infections such as dengue while travelling abroad,” he said.
“Simple steps, such as using insect repellent, covering exposed skin, and sleeping under insecticide-treated bed nets, can effectively reduce the risk of mosquito-borne infections.
“Before you travel, check the TravelHealthPro website for the latest health advice on your destination, including any recommended vaccinations. Even if you’ve been to a country before, remember that you don’t have the same level of protection against infections as permanent residents and are still at risk.”
Cases of anther imported mosquito-borne infection called Chikungunya have also risen across England, Wales and Northern Ireland according to the latest data.
In 2024, 112 cases of imported Chikungunya were recorded compared to 45 cases the year before.
Travellers can visit the Travel Health Pro website prior to their overseas trips to find out more about what vaccinations are available.
