Dengue Fever: Current Status and Risks

Confirmed dengue cases in Vietnam have surged significantly compared to the previous year, with some regions experiencing increases of more than fourfold. Southern Vietnam, including Nha Trang, has a tropical climate with active mosquito activity throughout the year, and transmission is of particular concern during the rainy season (approximately September–December).

Dengue fever is a viral infection transmitted through mosquitoes. It spreads when infected Aedes mosquitoes bite a person, and these mosquitoes are most active during daytime hours. Symptoms typically appear 4–7 days after a mosquito bite.

Key Symptoms of Dengue Fever

Common symptoms include high fever, severe headache, joint and muscle pain, pain behind the eyes, skin rash, nausea, vomiting, and diarrhea. In some cases, symptoms may be mild or unnoticeable.

If the condition progresses to severe stages, risks such as bleeding and shock syndrome may develop. It is important to seek medical attention immediately if you suspect symptoms. Diagnosis can be confirmed through blood tests at major hospitals and medical facilities in Nha Trang.

Correct Use of Mosquito Repellents

Insect repellent products containing 10–30% active ingredient are recommended. A 10% concentration provides protection for approximately 2 hours, and higher concentrations offer longer-lasting effects, though the correct application amount must be followed.

Mosquito repellent should not come into contact with the eyes, mouth, or open wounds. Since repellent is easily diluted by sweat, reapplication every 3–4 hours is advisable. Insect repellent should not be used on infants under 2 months old; instead, spraying it on strollers or using mosquito nets is recommended.

Daily Mosquito Prevention Measures

Clothing and Outdoor Precautions

Mosquitoes are more attracted to dark colors, so prepare light-colored long-sleeved tops and long pants for outdoor activities. Wearing thick fabrics such as cotton, linen, or denim reduces the risk of mosquito bites.

Indoor Environment Management

Choose accommodations with screens or mosquito nets and good air conditioning. When using air conditioning, periodically check windows to prevent mosquito entry.

Activity Time Adjustment

Dengue mosquitoes are most active in early morning and late evening, though they can bite at night. Where possible, avoid outdoor activities during these times or ensure thorough use of mosquito repellent.

Other Prevention Measures

Avoid strong perfumes or cosmetics, and refrain from visiting grassy or mountainous areas where mosquitoes are prevalent.

Response to Suspected Infection

There is no specific treatment for dengue fever, but supportive care such as hydration and pain management can help relieve symptoms.

Self-Care Precautions

Paracetamol (acetaminophen) is safe for reducing fever and alleviating pain. Aspirin and ibuprofen should be avoided, as they can increase the risk of bleeding. Adequate fluids should be consumed, including water, coconut water, and oral rehydration solutions.

If symptoms worsen or signs of vomiting or bleeding appear, visit a local hospital emergency room immediately. Medical facilities in Nha Trang, Anchor Bay, and Trần Phú areas provide care for foreign patients. You can request hospital recommendations from your accommodation management or hotel.

Vaccines and Additional Information

As of September 2024, the dengue vaccine (Qdenga) has been approved in Vietnam. However, there are restrictions on vaccine use. If you are considering an extended stay in Nha Trang, it is advisable to check vaccine availability and procedures in advance with local medical facilities or the Korean Embassy in Vietnam.

The most effective method of dengue prevention is avoiding mosquito bites. By making the above precautions a daily habit, you can enjoy a comfortable and safe stay in Nha Trang.

Verifying Latest Information

Hospital operating hours, departments, interpretation services, and insurance claim conditions may change. Please confirm directly with the hospital's official channels and your insurance provider before your visit.