Under a Creative Commons license open access Keywords West Nile virus Bangladesh Wild birds WNV West Nile virus (WNV), an arbovirus of the family Flaviviridae, is carried by mosquito vectors for which birds are the most common reservoir hosts. Humans and horses are dead-end hosts for WNV and cannot transmit the virus to other hosts. Around 20 % of WNV-infected human individuals will develop West Nile fever, and less than 1 % will develop severe symptoms such as encephalitis.
