East Bay bird tests positive for West Nile Virus

(KRON) — A bird infected with West Nile Virus was recently documented in San Ramon. The bird was Contra Costa County’s first to test positive for West Nile Virus in 2025.

The Contra Costa Mosquito and Vector Control District warns that infected birds are often the first sign that West Nile Virus is present in the region. Alameda and Santa Clara Counties have also confirmed cases of birds infected with West Nile Virus this year.

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“We typically start seeing West Nile-positive birds and mosquitoes in Contra Costa County around this time of year,” the Contra Costa Mosquito and Vector Control District said in a statement Monday. “Our neighboring counties have been reporting positive samples for several weeks now. As the weather warms up, the risk of human cases will continue to increase.”

An Ochlerotatus triseriatus mosquito feeds on a human hand on September 19, 2002. (James Gathany/Centers for Disease Control via Bay City News)

The virus was found in a California scrub jay. The bird was reported to the California West Nile Virus Call Center. Officials tested the bird and confirmed the infection.

The Contra Costa Mosquito and Vector Control District recommends residents dumping all standing water once a week to reduce the risk of mosquitoes.

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“And if, after dumping out all of the water on the property, the resident still experiences mosquito issues, Contra Costa County residents can contact the District to request mosquito service,” the district said. 

To reduce the risk of mosquito bites, the Contra Costa Vector Control District recommends using EPA-registered insect repellent with one of the following active ingredients:

  • DEET
  • Picaridin
  • The repellent version of Oil of Lemon Eucalyptus
  • IR3535
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