Abstract
Vector-borne diseases(VBDs) are reported to represent amount 17% of all
infectious diseases. The geographical distribution of vectors depends upon various
climatic factors, and social factors. In the recent past, the spread of VBDs across the
world is so rapid that it is associated with a change in climatic factors, global warming,
travel and trade, unplanned urbanization, deforestation etc. Amongst the vector-borne
diseases notable is West Nile fever (WNF) caused by West Nile Virus (WNV). WNF
belongs to the family of Flaviviridae, which is part of the Japanese encephalitis
antigenic group. WNV is transmitted from infected birds to human beings by mosquito
bites. WNV is readily reported in Africa, Europe, the Middle East, North America and
West Asia. Looking at the history, WNV was first isolated in a woman in the West Nile
district of Uganda in 1937. It was identified in birds (crows and columbiformes) in the
Nile delta region in 1953. Over the past 50 years, human cases of WNV have been
reported in various countries.