Dynamic Maps

Directions -
Click the small map to the left to view the West Nile Virus 2000 dynamic maps.  To explore these maps, move your cursor over the map key to select a map type.  Then move your cursor onto the colored areas of the map. A bar scale will appear showing the cumulative number of occurances for a particular week and the prevoius week. The text area on the control bar lists the name of the State or county that the cursor is over.

The cumulative number of occurances since the beginning of 2000 will appear as small text above the bar scale.

To change weeks use the forward and back buttonson the control bar.

Click one of the buttons under the conrtol bar to select a different map.

Information

Cases of West Nile virus (WNV) in the United States were first documented in the fall of 1999. WNV has been commonly found in humans and birds and other vertebrates in Africa, Eastern Europe, West Asia, and the Middle East, but had not previously been documented in the Western Hemisphere. The virus is transmitted to humans through the bite of a mosquito and can cause encephalitis - an inflammation of the brain. WNV interferes with normal central nervous system functioning. It is closely related to St. Louis encephalitis virus found in the United States. In 2000, the disease occurred in eighteen people in the New York City area and Northern New Jersey. There was only one fatality. The dynamic maps presented here document how the disease spread in 2000.

Related Links

• Division of Vector-Borne Infectious Diseases, Centers for Disease Control and Prevention
• 2001-2004 USGS West Nile Virus Maps, U.S. Geological Survey
• National Wildlife Health Center, U.S. Geological Survey
• Animal and Plant Health Inspection Service, U.S. Department of Agriculture
• Mosquito Control Information, Environmental Protection Agency