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West Nile Virus Surveillance 2001 - Mosquito Cases
What this map layer shows: The location of the 71 counties in 16 states where WNV mosquito cases were found in 2001.
Background Information
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. Mosquito surveillance was one of the mainstays of the surveillance program and included testing both adult and larval mosquitoes for the presence of WNV. Testing was done by 564 counties on approximately 1.4 million mosquitoes. 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 - Mosquito Cases database shows the location of the 71 counties in 16 States where WNV mosquito cases were found in 2001. 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. Additional information on WNV is available from the CDC West Nile virus basics page. Related Links: If you download the raw data of 2001 WNV Mosquito Cases you may also want to download the 2000 County Boundaries raw data. These two map layers can be used together to create a map of WNV occurrences. Download 2000 County Boundaries
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West Nile Virus Surveillance, 2001 - Mosquito Cases


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