Explanation:

Dengue is a mosquito-borne seasonal viral infection caused by any of four closely related viruses (DENV 1-4). The virus is transmitted by a bite of female mosquito of any of two species of mosquitoes of the genus Aedes. The mosquito, which typically bites humans in the daylight hours, can be easily recognized because of its peculiar white spotted body and legs. Outbreak of the disease typically occurs in summer season when the mosquito population reaches its peak. It occurs widely in tropical and subtropical areas in Asia, Africa, Central and South America. Unlike malaria, which is a major health concern in rural areas, dengue is equally prevalent in the urban areas too. In fact, it is predominantly reported in urban and semi-urban areas. WHO estimates that there may be 50 million dengue infections worldwide every year. A severe form of the infection is known as dengue hemorrhagic fever (DHF). DHF can be fatal if not detected.