Bay Area/ Oakland

West Nile Virus Alert: Second Infected Crow Found in Walnut Creek Amid Rising Temperatures

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Published on August 16, 2025
West Nile Virus Alert: Second Infected Crow Found in Walnut Creek Amid Rising TemperaturesSource: NIAID, CC BY 2.0, via Wikimedia Commons

The Contra Costa Mosquito and Vector Control District has confirmed a second American crow found in Walnut Creek this year has tested positive for West Nile virus (WNV), signaling an uptick in infected birds across not only Contra Costa but neighboring counties as well. The ill-fated crow was spotted and reported to the California WNV Call Center, confirming the postmortem case.

With the hot weather turning up the temperature gauge, it's not just our patience getting fried. Mosquitoes breed faster, going from eggs to bloodsuckers in less time, which increases the risk of WNV. Steve Schutz, Ph.D., Scientific Program Manager, said, per the Contra Costa Mosquito and Vector Control District, "Our recent hot weather can increase the risk of West Nile virus, as the heat allows mosquitoes to develop from egg to adult more quickly." He mentions that another dead bird popping up with the virus reminds the community to kick mosquitoes to the curb.

To keep these bloodthirsty pests at bay, the District is doubling down on advice for locals. Residents are urged to dump standing water weekly. However, if you've turned your property into the Sahara and still find yourself swatting away, help is just a phone call or click away. The district offers mosquito services, and concerned citizens are encouraged to report dead birds and canaries in the coal mine for WNV.

Aside from adopting your new water-dumping routine, the District recommends slathering on some EPA-registered insect repellent before venturing outdoors. Key ingredients to look for are DEET, Picaridin, the repellent form of Oil of Lemon Eucalyptus, or IR3535. Just remember to follow the instructions on the label to the letter. Alameda, Santa Clara, and Solano Counties have all registered cases of infected birds, signaling a regional concern. Reporting dead birds can be done via phone at (877) WNV-BIRD (968-2473) or online, as dead birds often signal the virus before it hits closer to home.