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. 

“West Nile virus is typically detected in the local mosquito population as summer temperatures rise and persists until the weather cools off in the fall,” said Steve Schutz, scientific programs manager for the district. “The District recommends that Contra Costa County residents take steps to protect themselves from West Nile virus and mosquito bites.” 

The district urged residents to inspect their yards at least once a week and dump out any standing water to eliminate places where mosquitoes can breed. 

Officials also recommend using U.S. Environmental Protection Agency-registered insect repellents containing DEET, picaridin, oil of lemon eucalyptus or IR3535 and following the directions on the product label. 

The district asked residents to report dead birds, which are often an early indicator of West Nile virus activity in an area. 

Residents who continue to experience mosquito problems after eliminating standing water can request mosquito control service from the district at no additional cost because the services are funded through property taxes. 

For more information, go to www.contracostamosquito.gov. Residents can report dead birds by calling (877) WNV-BIRD (968-2473) or online.

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.