Sonoma County Mosquitoes Test Positive for West Nile Virus

Release date: 
Sep 14

Cotati, CA. -The Marin/Sonoma Mosquito & Vector Control District (District) announced today that a group of mosquitoes tested positive for West Nile virus(WNv) in Sonoma County. The WNv positive mosquitoes were collected in the vicinity of Wilfred Avenue and Whistler Avenue in Rohnert Park. 

"The results of our surveillance data suggest an elevated risk for disease transmission to residents in the vicinty,"  said Angie Nakano, Scientific Programs Manager for the Marin/Sonoma Mosquito and Vector Control District. "It is extremely important that residents protect themselves from mosquito bites by employing personal protection measures such as wearing long sleeves and long pants, and applying an effective insect repellent to exposed skin." 

Repellents that contain an active ingredient which has been registered with the U.S. Environmental Protection Agency (EPA) have been proven to be most effective when applied according to the instructions on the label.  
District personnel will be conducting additional surveillance and control work in the area. Residents are urged to report stagnant water sources and mosquito problems to the Marin/Sonoma Mosquito and Vector Control District. 
  • Avoid being outdoors during peak mosquito activity (dawn and dusk).
  • Check and maintain all window and door screens.
  • Report mosquito problems or any area that could be producing mosquitoes at or 1-800-231-3236.
  • Report dead birds to the West Nile virus hotline at 1-877-968-2473 or online at
  • Wear mosquito repellent when outdoors at dusk and dawn. Use a repellent containing one of the following active ingredients: DEET, Picaridin, oil of lemon eucalyptus, or IR3535.