West Nile Virus
West Nile virus is commonly found in Africa, Asia and the Middle East. It was discovered in the United States in 1999 and is present today in all 48 contiguous states.1
West Nile virus can infect humans through mosquitoes. A mosquito contracts the virus from biting a contaminated bird.2
Fast Facts
- Abbreviated name: WNV
- Infection type: Viral
- Transmission: Birds to mosquitoes to humans
- Most cases occur during summer
- First appeared in U.S. in 19993
- First isolated in 19372
- Has been found in 111 bird species
- Has been found in about 12 mammals
- Symptoms are almost always mild4
- Infections can be severe or fatal in rare cases
- Less than 1% of infections develop severe illness2
2008 Outbreak
In early August of 2008, health officials reported an increase of the West Nile virus in Southern California. Officials stated the 2008 rates were reaching near-high levels, as recorded in 2004, when 21 people died and a total of 710 Southern California residents were infected. Rates of human infection previously fell between 2005 and 2007.5
Several other cases have been reported in 2008 across the United States. Places where cases of West Nile Virus have been documented include Washington State, New York State, Boston, Chicago and Dallas.6 7 8
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Symptoms
Scientific Classification
Disclaimer
The content in this page is not a substitute for professional medical advice. Please consult a physician for information on the West Nile virus.
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