West Nile Virus Information


West Nile Virus (WNV)

West Nile Virus Neuroinvasive Disease Incidence by State – United States, 2013

This map shows the incidence of human West Nile virus neuroinvasive disease (e.g., meningitis, encephalitis, or acute flaccid paralysis) by state for 2013 with shading ranging from 0.01-0.24, 0.25-0.49, 0.50-0.99, and greater than 1.00 per 100,000 population.

West Nile Virus Information Sheet

West Nile virus (WNV)

is most commonly transmitted to humans by mosquitoes. You can reduce your risk of being infected with WNV by using insect repellent and wearing protective clothing to prevent mosquito bites. There are no medications to treat or vaccines to prevent WNV infection. Fortunately, most people infected with WNV will have no symptoms. About 1 in 5 people who are infected will develop a fever with other symptoms. Less than 1% of infected people develop a serious, sometimes fatal, neurologic illness.

Centers for Disease Control Questions & Answers

Wyoming Department of Health (WDH) information about dead birds, how to handle them and whether or not testing should be done. WDH WNV home page

Dead Bird Reports

NEW!! Reports of dead birds are no longer being solicited by Wyoming Department of Health. Additionally the Wyoming State Veterinary Laboratory (WSVL) is no longer testing birds for WNV. So please do not submit dead birds from your area. The WDH and the WSVL tested dead birds for WNV from 2002-2006. Despite the number of birds that have been submitted for WNV testing since 2002 (1,432 birds in total), a small percentage (16%) have been found to be positive for WNV infection. The WDH has seen little correlation between avian WNV prevalence and human disease in Wyoming. More specifically, each season we learn of human WNV infection PRIOR to having an indication of avian WNV transmission occurring in proximal areas. Therefore, the decision has been made to discontinue testing dead birds for WNV.

The Wyoming Public Health Laboratory continues to test human WNV specimens free of charge when submitted by a healthcare provider. The WSVL continues to test horses for WNV infection.

We appreciate your ongoing support and cooperation with regard to bird specimen submission and will now depend on you to help convey the message that we are no longer able to perform this service.

Disposal of Dead Birds
If you find a dead bird on your property, please dispose of it in the following manner:
Obtain a plastic bag and place your hand inside the bag. Grab the bird with the hand that is inside the bag and reverse the bag until your hand is free and the bird carcass is in the bag. Double bag the carcass and dispose of it in your garbage can. It is not advisable to handle the dead bird with bare hands.

West Nile Virus and Horses

Horses are affected by West Nile virus (WNV) much more often than any other domestic animals. Many horses infected with WNV do not develop any illness, but of horses that become ill, about 30 percent die or need to be euthanized. Other livestock and poultry do not commonly show any illness if infected with WNV.

A WNV vaccine is available for horses. Please contact your veterinarian for more information. Additionally, because mosquitoes are linked with WNV transmission, you can prevent or control future WNV outbreaks among horses by controlling mosquito populations and preventing horses from being exposed to mosquitoes.

For more information on WNV prevention and control in equine and other livestock, visit the United States Department of Agriculture’s Animal and Plant Health Inspection Service (APHIS) West Nile Virus website at: USDA APHIS

For information on submitting horse samples for testing in Wyoming, visit the Wyoming State Veterinary Laboratory website at http://wyovet.uwyo.edu/.

Agriculture and Livestock
Cattle, sheep, and pigs rarely develop serious illnesses from West Nile virus (WNV) infection, and mortality in chickens has not been documented.

Other Resources
For information on West Nile virus and agricultural issues, visit the United States Department of Agriculture’s(USDA) Virus website at: http://www.aphis.usda.gov/vs/nahss/equine/wnv/

The Wyoming State Veterinary Lab

The Wyoming Livestock Board

The weed and pest council web site for local weed and pest district contact information www.wyoweed.org