Mosquito Protection in Thailand: What Works and What Doesn't

Mosquitoes in Thailand fall into two categories: the daytime Aedes aegypti mosquito (dengue fever carrier — active dawn to dusk) and the nighttime Anopheles mosquito (malaria carrier — active dusk to dawn). Dengue is the bigger risk for most travellers, with outbreaks occurring year-round but peaking in the rainy season (June–October). Malaria risk for most tourist areas is very low — primarily a concern in forested border areas near Myanmar and Cambodia, not in Bangkok, beach resorts, or major tourist destinations. The most effective protection: DEET-based repellent at 30–50% concentration applied to all exposed skin, especially ankles and feet (where Aedes mosquitoes prefer to bite). Reapply every 3–4 hours. Alternatives: Picaridin (equally effective, less skin irritation) and lemon eucalyptus oil (effective but shorter duration). Local Thai brands like Soffell and Shieldtox (DEET-based) are available everywhere for ฿30–60. Accommodation precautions: check for holes in window screens, use air-conditioning (mosquitoes dislike cold), or sleep under a mosquito net in budget guesthouses without AC. Citronella candles and coils provide some protection in outdoor areas. Wear long sleeves and ankle-covering clothing at dawn and dusk. If you develop sudden high fever within 14 days of visiting Thailand, seek medical attention immediately and mention you have been in a mosquito-endemic area.