Source:  Dengue    Tag:  introduction about dengue



Dengue virus infections are a significant cause of morbidity and mortality in many countries including Sri Lanka. Dengue virus infection gives rise to three main clinical entities: dengue fever dengue hemorrhagic fever and dengue shock syndrome. Typically, it is an acute febrile illness characterized by frontal headache, retro-ocular pain, muscle and join pain, nausea, vomiting and rash. Thrombocytopenia, impaired platelet function and coagulation abnormalities have a pathogenic role in its bleeding manifestations.

What is dengue fever? What is dengue hemorrhagic fever?

Dengue fever is a flu-like illness spread by the bite of an infected mosquito.

Dengue hemorrhagic fever is a severe, often fatal, complication of dengue fever.

What is the infectious agent that causes dengue?

Dengue and dengue hemorrhagic fever are caused by any of the dengue family of viruses. Infection with one virus does not protect a person against infection with another.

How is dengue spread?

Dengue is spread by the bite of an Aedes mosquito. The mosquito transmits the disease by biting an infected person and then biting someone else.


Severe bouts with Dengue Fever require continued blood testing, due to the substantial drop in platelets that occurs in cases of the Fever that last more than 5 days. Daily blood testing to monitor platelet count may be ordered for any case of Dengue, but should be expected starting on the fifth day of a case of Dengue Fever. This testing is different from a test to identify the virus, but instead is to monitor a potentially dangerous change in blood condition. As platelet testing is a routine blood work task, this testing is performed widely, efficiently, and the results can be known quickly.


There is no vaccine available for Dengue Fever. The only preventative measures revolve around mosquito control. On a health policy level, education about mosquito breeding and insecticide use are common dengue prevention measures. On a personal level, the use of insect repellent and mosquito netting, to prevent bites and therefore transmission, are also effective in redu


Transmitted by the main vector, the Aedes aegytpi mosquito, there are four distinct, but closely related, viruses that cause dengue. Recovery from infection by one provides lifelong immunity against that serotype but confers only partial and transient protection against subsequent infection by the other three. There is good evidence that sequential infection increases the risk of more serious disease resulting in DHF.

cing the odds of infection.