• Entry
  • Reader's guide
  • Entries A-Z
  • Subject index

West nile virus (wnv) is a vectorborne infectious disease of the family Flaviviridae and is found in both tropical and temperate regions. WNV normally transmits among birds, mosquitoes, and mammals (especially humans and horses). The virus circulates in the blood of birds (reservoir hosts) for a few days after infection. Mosquitoes, particularly Culex pipiens, C. restuan, C. tarsalis and C. quinquefasciatus, become infected when they feed on infected birds. Infected mosquitoes (vectors) can then transmit WNV to humans and horses through their bites. They also infect other birds when they bite again. The virus is injected from the mosquito's salivary glands into the blood stream where it can multiply and cause illness. It was initially believed that direct human-to-human transmission was impossible and that humans ...

    • Loading...
    locked icon

    Sign in to access this content

    Get a 30 day FREE TRIAL

    • Watch videos from a variety of sources bringing classroom topics to life
    • Read modern, diverse business cases
    • Explore hundreds of books and reference titles