Animation of the Spread of West Nile Virus in 2002

This animation shows disease spread data for the West Nile virus in Illinois between May 2, 2002 and August 13, 2002. To start the animation, scroll down and click the Play button (>>). You may also use the single-frame toggle buttons (< and >), or select a different speed to run the animation.

Please note that this animation is fairly large (576 KB) and may take some time to load. Your browser should have a progress bar at the bottom of the window which will tell you the status of the download. We appreciate your patience.

Some people have reported that the animation does not work in browsers other than Internet Explorer. We are currently looking for a solution to this problem.

Viewing image for 05/10/2002 Speed: Fastest Fast Normal Slow Slowest

Animation last updated on October 22, 2002.