Dengue is a viral infection transmitted by the bite of infected mosquitos in endemic areas. It is common in the tropics but outbreaks have been reported in parts of Europe and it is increasingly being found in UK travellers.   It mosquito is found in urban areas close to human habitation and feeds in the daytime hours.  There is no specific treatment if the disease is contracted. 


Vaccination is effective at preventing dengue fever and is even more important if you have ever had dengue fever before.  

Even if vaccinated still take precautions to reduce the chance of being bitten by mosquitos by:

  • Cover exposed skin by wearing long sleeved shirts, trousers & socks
  • Using a good insect repellent 
  • Use a mosquito net which is big enough to cover you without leaving any gaps
  • The mosquito that causes dengue is mostly active during the day


Initial symptoms include:

  • High temperature
  • Severe headache
  • Muscle and joint pain
  • Nausea and vomiting
  • Rash

Most patients improve and symptoms resolve 3-4 days after the rash appears but in a small proportion they may go on to more serious disease which can result in shock, fluid in the lungs and severe bleeding.

Dengue Fever Vaccination

Vaccine: Qdenga

Two doses 3 months apart (1 dose gives over 80% protection against dengue if there is no time for both doses before travel).


The JCVI has recommended that the dengue vaccination should be considered by those with a previous history of dengue infection, as the second infection tends to be the most severe.  It is currently unclear if those who have NOT had dengue before and are vaccinated may potentially have a more severe infection if they contract the DENV3 or DENV4 strains of the virus, although it does protect against DENV1 & DENV2.  In cases of uncertainty a blood test could be performed to check for evidence of previous infection as most first infections are mild or asymptomatic.

£95 per dose
£84 for blood test for previous infection