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How far has West Nile Virus spread here in North America?

April 26, 2017north america spread virus West Nile

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How far has West Nile Virus spread here in North America?

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It is believed to have entered the U.S. in 1999 at New York City via an imported bird. Since then it has spread to all areas of the United States as well as into Mexico and Canada. Birds appear to be the main conveyor of the disease here.