The death comes as West Nile virus activity has increased in both Yolo County and statewide, with more mosquito samples testing positive for the virus. Photo designed by Magnific

WOODLAND, CA (MPG) - Yolo County Public Health has confirmed the first death from West Nile virus in Yolo County in 2026. The resident had neuroinvasive West Nile virus, the most severe form of the disease.

The death comes as West Nile virus activity has increased in both Yolo County and statewide, with more mosquito samples testing positive for the virus. Public Health has confirmed two additional cases of neuroinvasive West Nile virus in county residents this year, after only recording a single case in 2025.

“Our thoughts are with those who are grieving the loss of this community member to West Nile virus,” said Dr. Joanna Locke, Yolo County health officer. “This is also a reminder that West Nile virus can cause serious illness. Older adults, people with weakened immune systems and those with certain underlying medical conditions are at greatest risk for severe illness.”

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 one in 150 people infected with West Nile virus develop severe neurological illness that may require hospitalization and can be fatal. 

“West Nile virus activity remains elevated throughout our region, and we are entering the time of year when mosquito populations and virus activity typically remain high,” said Gary Goodman, district manager of the Sacramento-Yolo Mosquito & Vector Control District. “Residents can help by eliminating standing water around their homes, using insect repellent and reporting mosquito problems so our staff can respond where needed.”

To reduce the risk of West Nile virus infection, Yolo County Public Health and the Sacramento-Yolo Mosquito & Vector Control District recommend following the Seven D’s of Mosquito Prevention:

DRAIN standing water to eliminate mosquito breeding sites.

DAWN and DUSK are times to limit outdoor activities, when mosquitoes are most active.

DRESS in long sleeves and pants when outdoors.

DEFEND against mosquitoes by always using an EPA-registered insect repellent, such as one containing DEET, picaridin or oil of lemon eucalyptus. Follow label directions.

DOOR and window screens should be in good working condition to prevent mosquitoes from entering your home. 

DISTRICT personnel are available to help with mosquito concerns by calling 1-800-429-1022.

The Sacramento-Yolo Mosquito & Vector Control District continues to monitor West Nile virus activity throughout the region and work to reduce mosquito populations.

The Yolo County Health and Human Services Agency also offers free insect repellent through its Wellness Vending Machine Program. For vending machine locations, 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, visit WestNile.ca.gov.