The Sutter-Yuba Mosquito and Vector Control District has confirmed the first West Nile virus-positive mosquito samples of 2026 in Yuba County and is urging residents to take precautions against mosquito bites. 

YUBA COUNTY, CA (MPG) - The Sutter-Yuba Mosquito and Vector Control District has confirmed the first evidence of West Nile virus activity in Yuba County this year after two mosquito samples tested positive for the virus.

The mosquito samples were collected July 7 in the Hallwood and Wheatland areas. District officials said surveillance traps show Culex mosquitoes, the primary carriers of West Nile virus, are at peak abundance.

The district said its surveillance program remains active and mosquito control operations are underway in areas where virus activity has been detected.

Health officials are urging residents throughout Yuba County to take precautions to reduce the risk of mosquito bites, regardless of where they live. Officials said avoiding mosquito bites remains the most effective way to prevent West Nile virus and other mosquito-borne illnesses.

The district recommends four key prevention measures:

Use insect repellent containing DEET, picaridin, oil of lemon eucalyptus or IR3535. Limit outdoor activities during dawn and dusk when mosquitoes are most active. Keep window and door screens in good repair to prevent mosquitoes from entering homes. Eliminate standing water from items such as flowerpot saucers, buckets, tires and birdbaths where mosquitoes can breed.

Residents are also encouraged to report dead birds, which can indicate West Nile virus activity, through the California Department of Public Health website at westnile.ca.gov or by calling 877-968-2473.

For more information about West Nile virus or mosquito control efforts, visit sutter-yubamvcd.org or contact the Sutter-Yuba Mosquito and Vector Control District at 530-674-5456, ext. 0, from 7 a.m. to 3:30 p.m. Monday through Friday, excluding holidays.