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| West Nile Virus Surveillance 2002-2004 |
What this map layer shows:
The occurrence of human, wild bird, and veterinary cases of West Nile
Virus during 2002, 2003, and 2004.
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| Background Information |
Sample Map
The West Nile virus (WNV) is a mosquito-borne disease that can cause
inflammation of the brain (encephalitis) in humans. It was first reported
in the United States in the fall of 1999 and presents a threat to humans,
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 2002
through 2004, WNV surveillance activities included monitoring human,
wild bird, veterinary, sentinel chicken flock, and mosquito cases.
WNV activity was reported to the CDC through the ArboNET surveillance
network which is a web-based surveillance data network comprising 55
State and local public health departments and CDC.
The data used to create these maps in the National Atlas of the United
States is not available for release by either the National Atlas
or the U.S. Geological
Survey (USGS). The CDC provided the data for
these map layers. The CDC obtains the data from State health departments
that have agreed with the CDC on public dissemination of that data
in certain forums: National Atlas and USGS maps, the Morbidity
and Mortality Weekly Report, the CDC
Web site, and select scientific
publications. For more information please contact the Centers for
Disease Control West Nile Virus Surveillance Team (email: dvbid@cdc.gov).
The West Nile Virus Surveillance 2002-2004 map layers show the occurrence
of human, wild bird, and veterinary cases and also indicate areas
for which no reports were received. The map layers do not include
sentinel chicken flocks or mosquito cases. Information is reported
for all 50 States, the District of Columbia, Puerto Rico, and the
U.S. Virgin Islands. Additional information on WNV is available from
the CDC
West Nile virus page and the National
Wildlife Health Center West Nile Virus Project page. Please note
that the 2004 maps show information accurate as of June 22, 2005.
The National Atlas also includes West Nile Virus map layers for 2000
and 2001, showing human, wild bird, veterinary, sentinel chicken, and
mosquito cases. These map layers can be viewed through the Map
Maker and are also available for download from the National
Atlas Raw Data Download page. USGS maps of West Nile virus occurrences from 2001 to
2005 are available on the USGS
West Nile Virus Maps page.
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