Dengue fever is usually a mild and self-limiting illness in most people but in some people it can progress to dengue hemorrhagic fever (DHF) or dengue shock syndrome. DHF is a complication of dengue fever which can be fatal. It usually occurs if a person has dengue infection more than once.
Dengue infection can be caused by any of the four related types of Dengue virus (DENV-1 to 4). One type of dengue virus can infect a person only once in his lifetime as it gives lifelong protective immunity against that particular type of infecting virus (homotypic immunity). A second infection is usually with a different type of dengue virus (if you were infected with DENV-1 the first time the second infection can be with DENV-2, DENV-3, or DENV- 4). The secondary infection with any type of dengue virus (e.g. DEN-2 followed by DEN-3) can cause severe and even fatal dengue infection such as dengue hemorrhagic fever or dengue shock syndrome. Read to know the symptoms of dengue hemorrhagic fever.
In early stages the symptoms of dengue hemorrhagic fever (DHF) are similar to dengue fever. Early symptoms are:
Acute phase symptoms of DHF include:
People with DHF need prompt and appropriate treatment. If you have symptoms suggestive of dengue fever due to DHF, consult your doctor.
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Read more on Dengue Signs and Symptoms.