More Mosquitoes Test Positive For West Nile Virus In Sonoma County

Release date: 
Jul 17

Cotati, CA.-The Marin/Sonoma Mosquito & Vector Control District (MSMVCD) has confirmed two more West Nile virus (WNv) positive mosquito samples. Both mosquito samples were collected in the vicinity of Asti Road and Citrus Fair Drive in Cloverdale. 


"This year is already proving to be a challenging year for mosquito control," stated Erik Hawk, Assistant Manager for the Marin/Sonoma Mosquito & Vector Control District."The residents of Marin and Sonoma counties need to take WNv seriously and report sources of standing water, adult mosquito issues and protect themselves from mosquito bites," stressed Hawk.


In order to reduce the number of adult mosquitoes and break the virus transmission cycle, an adult mosquito control application is scheduled to occur early Saturday morning in the area where the positive mosquitoes were collected, weather permitting.


Simple ways to help reduce exposure to mosquitoes and lessen the risk of WNv:

  • Check septic tank lids to ensure a tight seal, repair cracks and screen vent pipes using a fine mesh screen (1/16 of an inch).
  • Report mosquito problems, neglected swimming pools, or any area that could be producing mosquitoes at or 1-800-231-3236.
  • Stock backyard ponds or other permanent water features with mosquitofish.
  • 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. 
  • Residents interested in staying informed about district activities are encouraged to follow MSMVCD on twitter and facebook.