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West Nile Virus (Wnv) First Appeared in the United States in 1999

By Environmental Protection Agency

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Book Id: WPLBN0000055848
Format Type: PDF eBook
File Size: 1.4 MB
Reproduction Date: 2007
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Title: West Nile Virus (Wnv) First Appeared in the United States in 1999  
Author: Environmental Protection Agency
Language: English
Subject: Ecology, Natural resource issues, Environemtal protection
Collections: Environmental Awareness Library Collection
Publication Date:
Publisher: United States Environmental Protection Agency


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Agency, E. P. (n.d.). West Nile Virus (Wnv) First Appeared in the United States in 1999. Retrieved from

Excerpt: West Nile Virus (WNV) first appeared in the United States in 1999. Since its inital outbreak in New York City, the virus has spread across the country from East to West. Female mosquitoes transmit the virus primarily by infecting birds. Occasionally, mosquitoes transfer the virus from birds to humans, most of whom experience no symptoms. One out of five infected people develop West Nile fever, characterized by mild, flu-like symptoms. Infection can sometimes, although rarely, be fatal for humans. Since West Nile is lethal in some bird species, unusual bird deaths may signal human outbreaks.

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