Maps of Progression
The following maps show the progress of human cases of West Nile across the United States. States are colored according to the percentage of all U.S. West Nile cases they represented in that year. Zero percent (no cases) is colored white; less than 1% is blue; between 1% and 5% is green; between 5% and 10% is yellow, and greater than 10% of cases in a year is red.
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1999
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2000
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2001
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2002
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2003
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2004
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2005
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2006
Read more about this topic: West Nile Virus In The United States
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