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The '''West Nile Virus''' is a potentially deadly [[disease]] transmitted by [[mosquitoes]], which first entered the [[United States]] in 1999 from [[Africa]].  No antiviral treatments are available.

The '''West Nile Virus''' is a potentially deadly [[disease]] transmitted by [[mosquitoes]], which first entered the [[United States]] in 1999 from [[Israel]]<ref>https://wwwnc.cdc.gov/eid/article/12/4/05-1379_article</ref><ref>https://www.ncbi.nlm.nih.gov/pubmed/10600742</ref><ref>https://www.ncbi.nlm.nih.gov/pubmed/11585528</ref>.  No antiviral treatments are available. First identified in the West Nile district of Uganda in 1937, West Nile Virus is endemic across Europe, Africa, the Middle East, Australia, and West Asia. Since being introduced to the New World in 1999 in New York State, it has spread from Canada as far south as Venezuela. West Nile Virus is primarily a disease of birds, with humans, horses, alligators, and even killer whales being 'dead end hosts' - that is, hosts which can sicken from West Nile infection but which do not produce enough virus in their bloodstream to perpetuate transmission of the disease.  

The [[CDC]] explains:<ref>https://www.cdc.gov/westnile/symptoms/index.html</ref>

The [[CDC]] explains:<ref>https://www.cdc.gov/westnile/symptoms/index.html</ref>