What is West Nile virus?
West Nile virus is a virus that can infect humans, birds, horses and mosquitoes. Infection from this virus is most commonly found in Africa, West Asia and the Middle East. The virus spread to the United States in the summer of 1999, and has now been reported in 48 states.
West Nile Virus in the United States: An Update on an Emerging Infectious Disease by GD. Huhn, M.D., M.P.H.T.M., JJ Sejvar, M.D., SP Montgomery, D.V.M., M.P.H., and MS Dworkin, M.D., M.P.H.T.M. (American Family Physician August 15, 2003, http://www.aafp.org/afp/20030815/653.html)
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