Dengue is a mosquito-borne tropical disease caused by the dengue virus. Symptoms typically begin three to fourteen days after infection.This may include a high fever, headache, vomiting,muscle and joint pains,and a characteristic skin rash.Recovery generally takes two to seven days.
Dengue is spread by several species of mosquito of the Aedes type, principally A.aegypti.The virus has five different types; infection with one type usually gives lifelong immunity to that type,but only short-term immunity to the others. Subsequent infection with a different type increases the risk of severe complications.
Dengue has become a global problem since the Second World War and is common in more than 110 countries. Each year between 50 and 528 million people are infected and approximately 10,000 to 20,000 die.