Dengue Fever
Also known as: Breakbone fever, Dengue haemorrhagic fever, DENV
Dengue is a mosquito-borne viral infection causing high fever and joint pain, common in tropical destinations.
Last updated: 2 April 2026
Real-world example
A week after returning from Bali, you develop a sudden high fever (40°C), severe headache behind the eyes, and aching joints so painful you can barely move. A blood test confirms dengue. There's no specific treatment; you rest, hydrate, and avoid ibuprofen (which can worsen bleeding risk). You recover in 10 days but feel fatigued for weeks.
Why travellers need to know
Dengue is present in over 100 countries and is spreading to new areas due to climate change. There's no widely available vaccine for travellers (Dengvaxia is only for people with prior infection) and no specific treatment. Prevention is entirely about avoiding mosquito bites: DEET repellent, long sleeves at dawn and dusk, and air-conditioned or screened accommodation. Unlike malaria mosquitoes, dengue-carrying Aedes mosquitoes bite during the day.
Country-specific notes
Peak season: June-November; urban and rural risk
Thailand reports 50,000-100,000 dengue cases annually, peaking during the rainy season. Risk exists in both urban Bangkok and rural areas. Most tourist hotels have effective mosquito control, but outdoor activities during rain increase exposure.
Frequently asked questions
Related guides
How Nomedic helps
Your Nomedic record stores any previous dengue infections, which is critical information for doctors assessing severity if you contract a different serotype.
Sources
Your health records, anywhere you go
Previous dengue on record — doctors know your risk level.
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