First Human Case of West Nile Virus in Yolo County in 2026
Aug 11, 2026 12:38PM ● By Yolo County News Release
WOODLAND, CA (MPG) - The Yolo County Health and Human Services Agency’s (HHSA) Communicable Disease Program has confirmed the county’s first human case of West Nile virus in 2026. The individual, a Woodland resident, was hospitalized for their illness. This case is one of 18 reported statewide this year, making Yolo County the twelfth county in California to confirm a human infection. It also serves as a reminder that mosquitoes in Yolo County can carry and spread West Nile virus, and residents are urged to take precautions to protect themselves from mosquito bites.
West Nile virus is the most common mosquito-borne disease in California. While most people infected with the virus experience mild or no symptoms, approximately 20 percent develop flu-like symptoms such as fever, headache, body aches, nausea, or vomiting. Approximately 1 in 150 people develop severe neurologic illness requiring hospitalization and can even be fatal. Older adults, people with weakened immune systems, and those with certain underlying medical conditions are at greatest risk for severe illness.
“West Nile virus can have serious health consequences, but there are simple steps everyone can take to reduce their risk,” said Brian Vaughn, Yolo County Public Health Director. “Use an EPA-registered insect repellent whenever you are outdoors, eliminate standing water around your home where mosquitoes can breed, and wear long sleeves and pants when possible, especially during the early morning and evening hours when mosquitoes are most active.”
The Sacramento-Yolo Mosquito & Vector Control District continues to closely monitor West Nile virus activity throughout the region and conduct mosquito surveillance and control efforts to help reduce mosquito populations and protect public health.
“This first human case is an important reminder that West Nile virus continues to pose a public health threat in our communities,” said Gary Goodman, District Manager of the Sacramento-Yolo Mosquito & Vector Control District. “Weare entering the time of year when West Nile virus activity typically peaks, so it’s important for residents to protect themselves from mosquitoes Our staff will continue to closely monitor virus activity and conduct mosquito control treatments where needed.”
HHSA offers a Wellness Vending Machine Program that provides free wellness products to residents, including insect repellent. For vending machine locations, please visit www.YoloCounty.gov/Wellness-Vending-Machine.
For more information and resources, visit the Sacramento-Yolo Mosquito & Vector Control District's website at www.FIGHTtheBITE.net or call 1-800-429-1022. For more information about West Nile virus in California, including data and statistics, please visit WestNile.ca.gov.
