to the National Atlas Home page
About | Fact Sheets | Contact Us | Partners | Products | Site Map | FAQ | Help | Follow us on Twitter 
Part of Project LogoAgricultureBiologyBoundariesClimateEnvironmentGeologyGovernmentHistoryMappingPeopleTransportationWater
to the Interactive Map MakerMap LayersPrintable MapsWall MapsDynamic MapsArticlesMapping Professionals

Map Layer Info

West Nile Virus Surveillance 2001 - Human Cases

What this map layer shows:

The locations of the 66 confirmed human cases of West Nile Virus found in 2001.

opens the Centers for Disease Control and Prevention home page
Background Information
Sample map Sample Map
West Nile virus (WNV) is a mosquito-borne disease that can cause encephalitis (inflammation of the brain) in humans. It was first reported in the United States in the fall of 1999 and presents a threat to humans, horses, birds, and other vertebrates. The Centers for Disease Control and Prevention (CDC), Division of Vector-Borne Infectious Diseases collects information on the occurrence of WNV and works to develop improved methods for disease diagnosis, surveillance, prevention, and control. For 2001, WNV surveillance activities included monitoring human, veterinary, wild bird, sentinel chicken flock, and mosquito cases. Human cases were reported voluntarily by physicians who observed patients with clinical signs of WNV infection and requested laboratory testing. The CDC worked with the U.S. Geological Survey, U.S. Department of Agriculture Animal and Plant Health Inspection Service, State wildlife agencies, and State and local health and vector-control agencies to track the occurrence of WNV and to provide national and regional surveillance information to public health officials, elected government officials, and the public. The CDC provided the data for this map layer.

The West Nile Virus Surveillance 2001 - Human Cases database shows the location of the 66 confirmed human cases found in the 2001 surveillance area. The surveillance area encompassed all 50 States and the District of Columbia. Information is presented by county and includes the total number of confirmed WNV cases, for each week and for the entire year, as well as the number of samples submitted for testing, for each week and for the entire year. Additional information on WNV is available from the CDC West Nile virus basics page.

Related Links:

If you download the data of 2001 WNV Human Cases you may also want to download the 2000 County Boundaries data. These two map layers can be used together to create a map of WNV occurrences.
Download 2000 County Boundaries