Mosquitoes & Dengue

Repellent, timing, and the symptoms worth knowing

Mosquitoes here are a nuisance rather than a menace, but dengue fever is real and present in Thailand, so a little repellent is worth the effort.

When they bite

The mosquito that carries dengue bites in daylight, particularly around dawn and late afternoon — which catches out anyone expecting an evening-only problem. Numbers rise during and after the rainy season, when standing water is everywhere.

What actually works

  • Repellent with DEET or picaridin. Wristbands, apps and ultrasonic gadgets do not work.
  • Cover ankles and feet at dusk — that is where most bites land.
  • Sunscreen first, repellent second, with a few minutes between.
  • Air conditioning and a fan both help; mosquitoes are poor fliers in moving air.
  • Tip out standing water near where you are staying — a saucer under a plant pot is a nursery.

Dengue looks like this: sudden high fever, severe headache, pain behind the eyes, aching muscles and joints, and often a rash a few days in. See a doctor rather than riding it out — a simple blood test confirms it.

Take paracetamol, not ibuprofen or aspirin, which affect clotting and can make dengue considerably worse. If someone deteriorates as the fever falls — severe abdominal pain, vomiting, bleeding gums, restlessness — that is the dangerous phase and needs a hospital immediately.

Most visitors get a few bites and nothing more. Pack a repellent you like the feel of, and you will use it.

Anything We Have Not Covered?

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