San Ramon has reported its first case of West Nile virus in 2025, confirmed on July 21 by the Contra Costa Mosquito and Vector Control District. The virus was found in a California scrub jay, making it the first infected bird detected in Contra Costa County this year. West Nile virus activity in birds often signals an increased risk to humans, and similar reports have already emerged from neighboring Alameda and Santa Clara counties in recent weeks.

As temperatures rise during the summer months, health officials are urging residents to take mosquito prevention seriously. According to Steve Schutz, the district’s scientific program manager, now is the typical season when positive West Nile samples begin to appear in the county, and the risk of human cases will grow with the warmer weather.

How to Reduce Mosquito Risk
Officials recommend dumping out standing water sources such as buckets, flower pots, and bird baths at least once a week. Additionally, residents are advised to wear EPA-approved mosquito repellents containing DEET, picaridin, IR3535, or the oil of lemon eucalyptus to protect against bites.

Community Awareness and Reporting
Residents are encouraged to report dead birds by calling 877-968-2473 or using the state’s online reporting tool. Dead birds are often the first indicators of West Nile virus presence in a region. Contra Costa County residents can also request free mosquito inspections or treatment services by calling 925-685-9301 or filling out a request online through the Mosquito and Vector Control District’s official website.

Public health experts continue to monitor mosquito activity closely across the region. While no human cases have been confirmed in Contra Costa County so far this year, officials are emphasizing vigilance and proactive protection to prevent the virus from spreading further.