West Nile virus (WNV) is a mosquito-borne virus that was first detected in the United States in 1999. Since then, it has spread to some 40 States. The virus causes encephalitis or inflammation of the brain and has previously been found in Africa, western Asia, the Middle East, and the Mediterranean region of Europe. Only birds are known to infect mosquitoes with West Nile virus, and mosquitoes spread the disease to horses and humans.
For more info go to: http://www.aphis.usda.gov/oa/pubs/ada_ahwnv.html
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