West Nile Virus
What is West Nile virus?
West Nile virus (WNV) is a zoonotic disease found in humans, equines, camelids and wild birds.
What are the signs of infection?
Infected animals may have a fever as well as neurologic symptoms including hind limb weakness or paralysis, uncoordinated gait or stumbling, and facial tremors or twitching.
How is WNV transmitted?
Transmission is only through mosquitoes. After biting an infected bird, the mosquito can then transmit the infection to the next animal it comes in contact with.
What can I do to prevent WNV in my animals?
The best prevention is an annual vaccination for WNV. Because the source of transmission is mosquitoes, do what you can to control mosquito populations and eliminate exposure to them. This includes reducing standing water near your animals and managing turn-out to avoid exposure during the peak mosquito times of dawn and dusk.
Can WNV be passed to humans?
Yes. Humans can become infected with WNV after being bitten by an infected mosquito.
- For WNV concerns relating to humans, contact your local Public Health District.
- For WNV concerns relating to wild birds, contact the Idaho Department of Fish and Game at (208) 454-7646.
- For WNV concerns relating to horses, contact your veterinarian.
- For WNV concerns relating to WNV in multiple species, refer to the National Wildlife Health Center.
- For WNV questions in relation to pesticides, refer to the Division of Agricultural Resources.
West Nile virus is a notifiable disease in Idaho.
If you have a question that is not covered here, please contact us.
Contact your local Public Health District for concerns about WNV in Humans.
Contact IDFG about for concerns about WNV in Wild Birds.
Contact USGS about for concerns about WNV in Multiple Species.
Contact ISDA Ag Resources for questions relating to WNV and Pesticides.
