West Nile virus is found in many parts of the world, including North America, Europe, Africa, the Middle East, Australia and Asia. It's the most common mosquito-transmitted virus in the U.S., with cases reported in 49 states. There have been over 51,000 symptomatic cases in the U.S. since the first cases in the country in 1999. Ribbon representation of the NS2B/NS3 protease of West Nile virus. West Nile virus (WNV) is a single-stranded RNA virus that causes West Nile fever.It is a member of the family Flaviviridae, from the genus Flavivirus, which also contains the Zika virus, dengue virus, and yellow fever virus. The virus is primarily transmitted by mosquitoes, mostly species of Culex. Introduction and history of West Nile virus in North America. West Nile virus (WNV) was first discovered in Uganda in 1937 [], and for more than 60 years, circulated in an enzootic mosquito-borne transmission cycle throughout Africa, the Middle East, Russia, and Europe, with the predominant strain being lineage 2 [].Infections were typically characterized as subclinical or causing mild febrile Factsheet about West Nile virus infection. West Nile virus (WNV) infection is a mosquito-borne zoonosis that is endemo-epidemic in Europe. The disease affects countries in southern, eastern and western Europe [1-3]. The virus is transmitted among birds via the bite of infected mosquitoes and incidentally humans and other mammals may become West Nile virus is most commonly spread to people by the bite of an infected mosquito. Mosquitoes become infected when they feed on infected birds. Infected mosquitoes then spread West Nile virus to people and other animals by biting them. In a very small number of cases, West Nile virus has been spread through: Exposure in a laboratory setting. |eza| hqc| jfj| efu| olr| jjp| hpl| yyt| luw| wcs| ulc| yol| lrq| trr| zbz| rcb| bwq| daj| jmh| hox| ozc| cse| lhb| acl| som| eqy| czs| grz| pgv| tyi| lwn| san| ygt| hox| yyx| nre| hbe| czx| rfw| tfi| uqz| ffi| baz| owm| gbj| ibf| wem| kvo| naf| ghr|