File:York 1999 track.pngDescriptionYork 1999 track.png English: Track map of Typhoon York of the 1999 Pacific typhoon season. The points show the location of the storm at 6-hour
File:CK12 Life Science2.pdfin New York City
in 1999. Notice how rapidly the virus spread across the U.S.
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(Source: http://en.wikipedia.org/wiki/Image:WNVUSAMap.png, License: