Understanding Dengue Fever
Dengue (DEN-gee or DEN-gay) is a viral illness that is spread by mosquitoes. It is also called dengue fever. There are mild and moderate to severe forms of dengue. The mild form is most common. The severe form is called dengue hemorrhagic fever (DHF). Without treatment, DHF may cause death.
What causes dengue?
The virus is spread by Aedes mosquitoes. You can get the virus if you are bitten by an infected mosquito. The mosquitoes transmit the virus by biting a person with dengue and then biting another person. The mosquitos are present throughout the Western hemisphere. Dengue is uncommon in most of the U.S., except Puerto Rico. It is most common in the Caribbean, Latin America, Southeast Asia, Africa, and the Pacific Islands.
Symptoms of dengue
Mild dengue infection may have few symptoms. Moderate to severe dengue has 3 phases: febrile, critical, and recovery.
Symptoms of the febrile phase last 3 to 7 days and include:
Sudden high fever
Skin redness or red patches on the skin
Pain behind the eyes
Severe joint and muscle pain
Easy bruising and bleeding
The critical phase usually lasts 2 to 3 days. During this time, body temperature may return to normal. Symptoms of the critical phase include:
A person with severe dengue may have trouble breathing, severe bleeding, damage to organs, or dengue shock syndrome. This can be fatal, and is a medical emergency.
During the recovery phase, there is overall improvement. There may also be a rash and itchy skin. There may be heart and lung problems.
Diagnosing and treating dengue
See your healthcare provider if you have a fever or other symptoms within 2 weeks of returning from travel to an area where dengue occurs. Tell your provider where and when you traveled. Your provider can diagnose dengue fever with a blood test to check for the virus or antibodies in your blood.
If you have dengue fever, your treatment will depend on how severe your illness is. Symptoms are most commonly treated with bed rest and fluids. You may be given acetaminophen to reduce fever and pain. Don’t take aspirin, ibuprofen, or naproxen, as they may increase your risk of bleeding.
There is no vaccine for dengue fever. The best protection is to prevent mosquito bites. If you are traveling to an area where dengue fever is a risk:
Use insect repellent that contains 20% to 30% DEET on your skin and clothing
Stay in indoor areas that have screens or air conditioning
Use spray insecticide outdoors
Put a mosquito net around your bed
When to seek medical care
Seek IMMEDIATE emergency care if you have any of the following symptoms: