In 2026, Cambodia is celebrating a major public health milestone: the official elimination of local malaria transmission. However, while one battle has been won, the tropical climate continues to support other mosquito-borne challenges.
Whether you are a local resident or a traveler, staying informed about these “buzzing” threats is essential for your safety. Here is a comprehensive guide to the mosquito-borne diseases currently found in Cambodia, their symptoms, and how to manage them.
1. Dengue Fever (The most common threat)
Dengue remains the primary mosquito-borne concern in Cambodia, particularly during the rainy season (May–October). It is transmitted by the Aedes mosquito, which is most active during the daytime.
- Symptoms: High fever (up to 40°C), severe headache, pain behind the eyes, joint and muscle pain (“breakbone fever”), and a flat, red rash.
- The “Warning Stage”: As the fever drops, look for severe abdominal pain, persistent vomiting, or bleeding gums. This can indicate Dengue Hemorrhagic Fever (15%), which requires immediate hospitalization.
- Diagnosis: A rapid blood test (NS1 antigen or PCR) can confirm the virus within the first few days.
- Treatment: There is no specific antiviral. Management includes strict bed rest, plenty of fluids, and Paracetamol for pain.
- ⚠️ CRITICAL: Avoid Ibuprofen or Aspirin, as these can increase the risk of internal bleeding in Dengue patients.
- Preventive vaccination: Qdenga (available at Intercare)
2. Chikungunya (The “doubled-over” virus)
Often mistaken for Dengue, Chikungunya saw a significant resurgence in Cambodia over the last few years. While rarely fatal, it is known for causing debilitating physical discomfort.
- Symptoms: Abrupt onset of fever and extreme joint pain, often in the hands and feet. The name translates to “that which bends up,” referring to the stooped posture of patients.
- Diagnosis: Blood tests (ELISA or PCR) to detect the virus or its antibodies.
- Treatment: Similar to Dengue: supportive care with fluids and pain relief. Most symptoms resolve in a week, but joint pain can sometimes linger for months.
- Vaccine: VIMKUNYA (Bavarian Nordic) – patients > 12 years old – efficiency: 98% after one injection. This vaccine is not available at Intercare.
3. Japanese Encephalitis (Rural risk)
This virus is transmitted by Culex mosquitoes, which breed in rice paddies and are most active at night. It is primarily a concern in rural areas where pigs and wading birds live near humans.
- Symptoms: Most infections are mild or asymptomatic. However, about 1 in 250 cases result in severe brain inflammation (encephalitis), leading to high fever, neck stiffness, seizures, and even coma.
- Diagnosis: Testing of blood or cerebrospinal fluid (via lumbar puncture).
- Treatment: No cure exists; treatment is limited to supportive care in a hospital setting (respiratory support, IV fluids).
- Prevention: there is a highly effective vaccine for Japanese Encephalitis : IMOJEV available at Intercare.
4. Malaria (The success story)
As of early 2026, Cambodia has achieved its goal of zero indigenous malaria cases. However, “Imported Malaria” remains a risk for those crossing borders from neighboring countries.
- Symptoms: Shaking chills, high fever, profuse sweating, and anemia.
- Diagnosis: Rapid Diagnostic Tests (RDTs) or microscopic examination of a blood smear.
- Treatment: Artemisinin-based Combination Therapy (ACT). Because of the history of drug resistance in the region, treatment should only be managed by certified clinics or the National Center for Malaria (CNM).
Summary Table: quick reference
| Disease | Primary Vector | Active Time | Key Symptom | Vaccine? |
| Dengue | Aedes | Day | Pain behind eyes / Rash | Yes (Qdenga) |
| Chikungunya | Aedes | Day | Severe joint swelling | Yes |
| Japanese Encephalitis | Culex | Night | Stiff neck / Confusion | Yes |
| Malaria | Anopheles | Night | Chills & Sweating | No |
How to protect yourself
The best treatment is prevention. Follow the “3 Ds”:
- DEET: Use insect repellent containing at least 20-30% DEET or Picaridin.
- Dress: Wear long sleeves and pants, ideally light-colored, as dark colors attract mosquitoes.
- Drain: Eliminate standing water around your home (flower pots, tires, buckets) where mosquitoes lay eggs.
1. Repellents (The Essentials)
- DEET (20-50%): The gold standard. Look for brands like Bushman or OFF! Deep Woods or Insect ecran. Higher percentages don’t repel “better,” they just last longer.
- Picaridin: A great alternative to DEET if you have sensitive skin or want something odorless that won’t damage plastic gear (like sunglasses or camera bodies).
- Repellent Wipes: Perfect for your day bag or carry-on to touch up your face and neck without getting spray in your eyes.
2. Protective Clothing & Gear
- Permethrin Spray: A “game-changer.” Spray this on your clothes, socks, and backpacks before you leave. It stays effective through 6+ washes and kills mosquitoes on contact.
- Light-Colored, Loose Clothing: Mosquitoes are attracted to dark colors. Choose linen or “wicking” synthetic fabrics; they keep you cool and make it harder for a needle to reach your skin.
- Long Socks: Ankle bites are common at outdoor restaurants. Tucking pants into socks is a pro move for jungle treks.
- Head Net: If you’re planning on sunrise temple tours or deep-jungle hiking, a lightweight mesh head net can save your sanity.
3. Indoor/Accommodation Security
- Portable Mosquito Net: Essential if you’re staying in rural homestays or “eco-bungalows” that don’t have sealed windows. Look for a “Permethrin-treated” net.
- Plug-in Vaporizers: Small electric devices (available in most Cambodian pharmacies/marts) that release a scentless repellent; great for hotel rooms.
- Duct Tape: A tiny roll can patch a hole in a window screen or a mosquito net in seconds.
4. The “Just-In-Case” Med Kit
- After-Bite Relief: Hydrocortisone cream or Calamine lotion to stop the itch.
- Tip: Scratching creates open sores that easily get infected in the humid Cambodian heat.
- Paracetamol (Acetaminophen): Your only choice for fever.
- ❌ AVOID: Ibuprofen, Aspirin, or Naproxen until Dengue is ruled out by a doctor.
- Oral Rehydration Salts (ORS): Tropical fevers lead to rapid dehydration. These are vital for recovery.
