Release date: 
Jul 31

Cotati, Ca - The Marin/Sonoma Mosquito & Vector Control District (MSMVCD) has confirmed its seventh West Nile virus positive mosquito sample collected from the vicinity of Citrus Fair Drive and Asti Road. This specific area in Cloverdale has proven to be a hot spot for West Nile virus activity this year. In addition, a dead bird tested positive for West Nile virus that had been collected from the vicinity of Brenda Way and Baron Drive in Rohnert Park.


"The recent above average temperatures can cause rapid mosquito production and speed up virus amplification in infected mosquitoes," stated Sarah Brooks, Lead Biologist for the Marin/Sonoma Mosquito and Vector Control District. "Continued mosquito surveillance and control will be important in minimizing the potential for the virus to spread."


MSMVCD staff continues to trap, test and monitor the abundance of adult mosquitoes. Vector Control Technicians are inspecting the area for new sources of mosquito production as well as checking and treating all known sources.


Residents are urged to continue to report mosquito problems in their area and to reduce mosquito production sites in their yards by removing standing water on a regular basis.  Most importantly, residents should use personal protection measures against mosquito bites. Wearing long sleeved shirts, long pants and applying an effective repellent to exposed skin will help reduce the risk of WNV transmission from an infected mosquito.

 Other 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 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
  • Residents interested in staying informed about district activities are encouraged to follow MSMVCD on twitter and facebook.