Contra Costa Vector Control. The Contra Costa Mosquito & Vector Control District is reporting five dead birds, a group of mosquitoes, and a chicken that have tested positive for West Nile virus. Many plant species in Contra Costa County harbor rodents.
While not currently in Contra Costa County, two invasive species that can transmit Zika, dengue, yellow fever, and chikungunya are in other parts of the state.
Scientific Programs Manager at Contra Costa Mosquito & Vector Control District.
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Contra Costa Mosquito and Vector Control District (Concord, CA). The Contra Costa Mosquito & Vector Control District is reporting five dead birds, a group of mosquitoes, and a chicken that have tested positive for West Nile virus. Contra Costa Mosquito & Vector Control.