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Current Virus Activity

Learn more about the current West Nile virus activity in Contra Costa County.

Current Adult Mosquito Control Info |2023 Virus Activity To Date | Receive Notifications

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NEW: Excessive Rain, Snowmelt, and High Tides Require New Technology .

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One of the two species that can transmit Zika, dengue, yellow fever, and chikungunya, was found in Contra Costa County in August, 2022.

The District is celebrating a milestone as a public health agency.