09/23/2026
The Walla Walla County Department of Community Health (WWCDCH) is reporting the county’s first case of West Nile virus (WNV) in 2026. The individual, who is now recovering from the illness, was most likely exposed to infected mosquitoes within Walla Walla County.
WNV is transmitted through the bite of an infected mosquito. Anyone living in or visiting an area where WNV is present in mosquitoes can get infected. The virus is most often found in south central Washington, and less commonly in other parts of the state. Although mosquito populations decrease with cooler weather, WWCDCH urges the public to take protection measures to prevent mosquito bites and reduce mosquito habitats. Best practices include:
• Limit time outside from dusk to dawn when mosquitoes are most active.
• Use an effective, EPA-registered insect repellent when spending time in areas with mosquitoes. This includes buying or treating clothing and outdoor gear with permethrin to kill or repel mosquitoes.
• Wear long sleeves, long pants, and socks while outdoors when in areas with mosquitoes.
• Mosquito-proof your home by installing or repairing screens on windows and doors.
• Remove standing water where mosquitoes can lay eggs. This includes flowerpots, gutters, buckets, pool covers, pet water bowls and troughs, discarded tires, and birdbaths. If emptying is not possible, cover water sources or change water at least twice per week.
• West Nile virus can also cause serious illness in horses. To protect your horse, ask your veterinarian about the West Nile virus vaccine.
While most people infected with West Nile virus do not develop symptoms, about one in five people who are infected will develop a sudden fever, headache, body aches, joint pain, vomiting, diarrhea, or a mild body rash. About one in 150 people will develop severe illness, resulting in encephalitis, meningitis, or other complications. In some cases, it can be fatal. People over the age of 60 years old and those with certain medical conditions, such as cancer, diabetes, hypertension, or kidney disease are at greater risk for serious illness. Individuals who experience symptoms of WNV should contact their healthcare provider.
Learn more at https://dch.wwcowa.gov/news_detail_T23_R127.php