Dengue hemorrhagic fever is a severe, potentially deadly infection spread by certain species of mosquitoes (Aedes aegypti).
See also: Dengue fever
Four different dengue viruses are known to cause dengue hemorrhagic fever. Dengue hemorrhagic fever occurs when a person catches a different type dengue virus after being infected by another one sometime before. Prior immunity to a different dengue virus type plays an important role in this severe disease.
Worldwide, more than 100 million cases of dengue fever occur every year. A small number of these develop into dengue hemorrhagic fever. Most infections in the United States are brought in from other countries. It is possible for a traveler who has returned to the United States to pass the infection to someone who has not traveled.
Risk factors for dengue hemorrhagic fever include having antibodies to dengue virus from prior infection and being younger than 12, female, or Caucasian.
Early symptoms of dengue hemorrhagic fever are similar to those of dengue fever, but after several days the patient becomes irritable, restless, and sweaty. These symptoms are followed by a shock -like state.
Bleeding may appear as tiny spots of blood on the skin (petechiae) and larger patches of blood under the skin (ecchymoses). Minor injuries may cause bleeding.
Shock may cause death. If the patient survives, recovery begins after a one-day crisis period.
Early symptoms include:
Acute phase symptoms include:
A physical examination may reveal:
Tests may include:
Because Dengue hemorrhagic fever is caused by a virus for which there is no known cure or vaccine, the only treatment is to treat the symptoms.
With early and aggressive care, most patients recover from dengue hemorrhagic fever. However, half of untreated patients who go into shock do not survive.
Call your health care provider if you have symptoms of dengue fever and have been in an area where dengue fever is known to occur, especially if you have had dengue fever before.
There is no vaccine available to prevent dengue fever. Use personal protection such as full-coverage clothing, netting, mosquito repellent containing DEET, and if possible, travel during periods of minimal mosquito activity. Mosquito abatement programs can also reduce the risk of infection.
Hemorrhagic dengue; Dengue shock syndrome; Philippine hemorrhagic fever; Thai hemorrhagic fever; Singapore hemorrhagic fever