An Ochlerotatus triseriatus mosquito feeds on a human hand on September 19, 2002. Also known as Aedes triseriatus and commonly known as the ‘treehole mosquito’, this species been identified as positive for West Nile virus. (James Gathany/Centers for Disease Control via Bay City News)

The Contra Costa Mosquito and Vector Control District has detected the first West Nile virus-infected mosquitoes of the year in the county, officials announced Wednesday. 

The infected mosquitoes were collected from a trap near Pacheco Marsh in the Martinez waterfront area, according to the district. 

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A graduate student at UC Berkeley's School of Journalism, Joshua is a storyteller, documentary filmmaker and multimedia producer with experience across journalism and media production. He is passionate about using compelling narratives to connect communities, amplify diverse voices and explore issues that impact everyday people.