UKHSA urges travellers heading abroad to protect against mosquito borne infections
As the holiday season approaches, the UK Health Security Agency (UKHSA) is reminding those heading abroad to take precautions against mosquito borne infections. The latest UKHSA data show a rise in travel-related mosquito borne infections such as dengue and malaria, which can cause serious illness. These infections have been confirmed in parts of the UK among individuals returning from abroad.
The annual malaria report for 2023 shows that there were 2,106 cases of imported malaria reported in the UK. This is 26% higher than the cases reported in 2022 (1,555 cases) and is the highest total number of cases seen in the UK since 2001. The rise in cases is linked to the resurgence of malaria in many countries and an increase in overseas travel following the removal of pandemic restrictions.
Six malaria-related deaths were also reported in the UK in 2023, which is the same as the annual average of 6 deaths between 2014 and 2023. Malaria is a potentially fatal disease that is almost completely preventable when malaria prevention tablets are taken appropriately. Provisional figures indicate that 753 travel-acquired malaria cases were reported in the UK between January and June 2024.
In a separate report, looking at other mosquito born infections between January and June 2024, there were 473 dengue cases reported in returning travellers across England, Wales, and Northern Ireland, a significant increase from the 157 cases reported during the same period in 2023. This is the highest number of cases reported in the first six months of any year since dengue surveillance began in 2009 and reflects the substantial rise in cases reported globally in 2024. The Joint Committee on Vaccination and Immunisation (JCVI) has recently recommended a dengue vaccine for some travellers.
Between January and June 2024, eight Zika virus cases were reported in England, Wales, and Northern Ireland, an increase from one case during the same period last year. Most cases were linked to travel in South-East Asia. Although Zika virus cases are rare, the infection poses a significant risk to pregnant women, as it can be passed to the fetus. There is no drug or vaccine to prevent Zika virus infection. The only way to prevent infection is by minimising mosquito bites or by avoiding visiting regions with a known or potential Zika virus risk.
Dr Philip Veal, Consultant in Public Health at UKHSA, said:
As many people prepare to travel over the winter period, it is important to take precautions against serious mosquito-borne infections. Simple steps, such as using insect repellent, covering exposed skin, and sleeping under insecticide-treated bed nets, can help reduce the risk of malaria, dengue, and Zika virus infection. Taking malaria prevention tablets appropriately is highly effective in avoiding the disease. Before you travel, check the TravelHealthPro website for the latest health advice on your destination. 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.
Dr Dipti Patel, Director of the National Travel Health Network and Centre, said:
People travelling abroad during the Christmas break should plan ahead to ensure they have a safe and healthy trip. You should read the relevant country pages on the TravelHealthPro website and consult a GP, pharmacy, or travel health clinic at least 4 to 6 weeks before the trip. This is to ensure that your vaccinations are up to date and to receive any necessary health advice. Upon returning to the UK, if you're feeling unwell, you should seek medical attention and inform your healthcare provider about your recent travel.
The Travel Health Pro website, supported by UKHSA, has information on health risks in countries across the world. It is a one-stop-shop for information to help people plan their trip abroad. Ideally travellers should consult their GP, practice nurse, pharmacist, or travel clinic at least 4 to 6 weeks before their trip for individual advice, travel vaccines and malaria prevention tablets, if relevant for their destination. Travellers who may be eligible for dengue vaccine should consult 3 to 4 months before travel.
In countries with insects that spread diseases like dengue, malaria or Zika virus infection and Oropouche virus disease, travellers can protect themselves by using insect repellent, covering exposed skin, and sleeping under an insecticide-treated bed net where air conditioning is not available.
It is also important for travellers to:
- ensure your routine childhood vaccines are up to date
- have any recommended travel related vaccines
- stock up on necessary medications including malaria prevention tablets
- get valid travel insurance to cover your entire trip and planned activities
There has been a rise in Oropouche infections globally recently, although there have been no confirmed cases diagnosed in this country this year. Oropouche virus (OROV) is spread predominantly by midge bites rather than mosquito bites. Due to the increase in cases, and some recent concerns regarding OROV infection during pregnancy, pregnant travellers should take particular care. A recent study found OROV in the semen of an infected individual, suggesting sexual transmission may be possible. Travellers concerned about spreading OROV through sex should consider using condoms or avoiding sex during travel and for six weeks after returning.
