Causes of Dengue Fever

Infection with one virus does not protect a person against infection with another. A person can be infected by at least two, if not all four types of the dengue virus at different times during a life span, but only once by the same type. People contract dengue fever from the bite of an infected Aedes mosquito. Mosquitoes become infected when they bite infected humans, and later transmit infection to others.If not treated properly, dengue hemorrhagic fever may occur. Dengue hemorrhagic fever is severe and often fatal.Dengue fever can be caused by any one of four types of dengue virus:

  • DEN-1
  • DEN-2
  • DEN-3
  • DEN-4

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