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Protecting Public Health Since 1927 Quicklinks About Us Request Services For News Media Frequently Asked Questions Subscribe Featured 2023 West Nile Virus Activity A map that details mosquitoes, dead birds, chickens, and horses that have tested positive for West Nile virus. You can zoom in and out of the map and click on the place-markers to get a detailed…
Commonly referred to as the Yellow Fever mosquito, the Aedes aegypti mosquito has a worldwide distribution in tropic and subtropical areas, and in August, 2022, Aedes aegypti were found in Contra Costa…
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