West Nile fever

About

  • It is a viral infection typically spread by mosquitoes.
  • Vaccines are available for use in horses but not yet available for people.
  • WN virus is maintained in nature in a mosquito-bird-mosquito transmission cycle.
  • Mosquitoes of the genus Culex are generally considered the principal vectors of WNV, in particular Cx. Pipiens. WNV is maintained in mosquito populations through vertical transmission (adults to eggs).
  • Birds are the reservoir hosts of WNV.
  • West Nile Virus (WNV) can cause neurological disease and death in people. WNV is commonly found in Africa, Europe, the Middle East, North America and West Asia.
  • WNV is maintained in nature in a cycle involving transmission between birds and mosquitoes. Humans, horses and other mammals can be infected.
  • West Nile Virus (WNV) is a member of the flavivirus genus and belongs to the Japanese encephalitis antigenic complex of the family Flaviviridae.
  • Rarely the virus is spread through blood transfusions, organ transplants, or from mother to baby during pregnancy, delivery, or breastfeeding.
  • It otherwise does not spread directly between people.
  • Diagnosis is typically based on symptoms and blood tests.

Do You Know?

  • West Nile Virus (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 Nile delta region in 1953.
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