dengue

ABSTRACT : Dengue estimate indicate 390 million dengue viral infections per year of which 96 million manifest clinically. About 3.9 billion people are at risk of infection with dengue viruses,70% of burden is shouldered by asia. Dengue is a mosquito-borne tropical disease caused by the dengue virus,. virus belongs to family Flaviviridae. It has four serotypes. Dengue fever is transmitted by the bite of an Aedes mosquito infected with a dengue virus. . Illness range from mild asympatomatic to severe dengue haemorragic fever/dengue shock syndrome. In india,the first epidemic of dengue – like illness was recorded in Madras IN 1780 and the first virologically proved epidemic of dengue fever occurred in Calcutta. In estimated 400 million dengue infections occur worldwide each year, with about 96 million resulting in illness. Symptoms, which usually begin four to six days after infection and last for up to 10 days, Sometimes, symptoms are mild and can be mistaken for those of the flu or another viral infection. The symptoms may progress to massive bleeding,shock and death. People with weakened immune systems as well as those with a second or subsequent dengue infection are believed to be at greater risk for developing dengue hemorrhagic fever.