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Crow tests positive for West Nile virus in Contra Costa County
By Tor Smith at KRON4 (KRON-TV)
· July 3, 2026
· 1 min read
(KRON) -- A young American crow from El Cerrito is the first bird to test positive for West Nile virus (WNV) in Contra Costa County in 2026, according to the Contra Costa Mosquito and Vector Control District. No human cases have been reported. "So far this summer, one group of mosquitoes from Mar...
Key takeaway "So far this summer, one group of mosquitoes from Martinez and one [...
Why this matters in The San Francisco
The discovery of a West Nile virus-positive crow in El Cerrito raises concerns for San Francisco residents, given the proximity of Contra Costa County to the city. As the summer months continue, the risk of mosquito-borne illnesses may increase, and San Francisco's own mosquito control efforts will be crucial in preventing the spread of the virus. The fact that no human cases have been reported in Contra Costa County is reassuring, but it also underscores the need for ongoing vigilance and preventive measures. San Francisco's residents should be aware of the potential risks and take steps to protect themselves, such as eliminating standing water around homes and using insect repellent. The city's public health department will likely be monitoring the situation closely, and residents can expect updates on any necessary precautions to take in the coming weeks.
About this story
Original reporting by KRON4 (KRON-TV) . The San Francisco surfaces reporting from trusted publishers and adds local editorial context so readers can quickly understand what a story means for their community. We attribute every source, link to the original report, and follow a documented editorial standards policy. To understand how stories are selected and reviewed, read our about page .
For the complete original report, visit KRON4 (KRON-TV) . Have a tip or correction? Contact our newsroom .
Category: local ·
Published: July 3, 2026 ·
Source: KRON4 (KRON-TV) ·
Reading time: 1 min
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Frequently asked about this story
What is this story about? (KRON) -- A young American crow from El Cerrito is the first bird to test positive for West Nile virus (WNV) in Contra Costa County in 2026, according to the Contra Costa Mosquito and Vector Control District. No human cases have been reported. "So far this summer, one group of mosquitoes from Mar...
When was this published? This article was first published on July 3, 2026 by KRON4 (KRON-TV) and curated for The San Francisco readers.
Who reported this story? This story was reported by Tor Smith at KRON4 (KRON-TV). To learn more about how The San Francisco selects and reviews stories, see our editorial standards .
Where can I find related coverage? See more local coverage from The San Francisco, or browse our daily briefing and topic hubs .
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