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Health Department

Bureau of Epidemiology

West Nile Virus

West Nile Virus (WNV) is a Flavivirus and was first isolated in the West Nile District of Uganda in 1937. Since that time the virus has been found in humans, birds, and other animals in Africa, Eastern Europe, West Asia and the Middle East. WNV has also been detected in Puerto Rico, the Dominican Republic, Jamaica, Guadeloupe, and El Salvador.

WNV was first reported in the United States in Queens, New York City in 1999. Since that occurrence the virus has spread across 48 states, and into Canada and Mexico. The virus was isolated in Utah in 2003.

In most humans, West Nile virus infection causes a mild or moderate, short-lived flu-like illness, or causes no symptoms at all.

In some cases it can cause invasive neurological disease (meningitis or encephalitis), particularly among persons 50 years of age and older, but any person of any age can contract serious disease, so it is important to protect yourself from the virus. The virus also affects horses, and wild bird species.

West Nile Virus Activity in Salt Lake County

Year

West Nile Fever

West Nile Neurological Disease

Fatalities

Case Fatality Rate

2011

1

0

0

0%

2010

0

0

0

0%

2009

0

1

0

0%

2008

8

1

0

0%

2007

16

15

2

6%

2006

33

22

1

2%

2005

1

5

0

0%

2004

2

0

0

0%

2003

0

0

0

0%

Local Resources

West Nile Virus Fact Sheet

State Resources

Utah Department of Health - West Nile virus

Utah Department of Agriculture and Food

Utah Division of Wildlife Resources – Fact Sheet

Utah Division of Wildlife Resources – Bird Identification

Mosquito Abatement

Utah Mosquito Abatement Association

Magna Mosquito Abatement District

Salt Lake City Mosquito Abatement District

South Salt Lake Mosquito Abatement District

National Resources

Disease Information

Centers for Disease Control and Prevention – West Nile virus

Centers for Disease Control and Prevention – WNV and Wild Game Meat

U.S. Geological Maps - West Nile virus activity

U.S. Department of Agriculture

U.S. National Library of Medicine, National Institutes of Health

MedLine Plus

Mosquito Information

National Pesticide Information Center

Environmental Protection Agency - Mosquitoes

American Mosquito Control Association

American Mosquito Control Association – Summer Safety

National Biological Information Infrastructure