Adult Mosquito Sample from Western Santa Rosa Tests Positive for West Nile Virus

Release date: 
Oct 17

Cotati, California- The Marin/Sonoma Mosquito & Vector Control District (District) announced today that an adult mosquito sample from western Santa Rosa has tested positive for West Nile virus.

Vector control technicians will check all known mosquito breeding sources in the area, as well as search for new sources. The District will place additional mosquito traps in surrounding areas.
“We encourage residents to report mosquito problems and/or potential mosquito breeding areas so that we can do everything possible to prevent the spread of West Nile virus” said Jim Wanderscheid, District Manager.
Residents are urged to protect themselves from mosquitoes by following these simple tips:
Be aware that mosquitoes are most active between dusk and dawn.
When outdoors, wear long-sleeved shirts, long pants, and apply insect repellent according to label instructions. Repellents containing the active ingredient DEET, Picaridin or Oil of lemon eucalyptus are most effective

  • Screen all windows and make sure existing screens are in good repair.
  • Cover septic tanks and screen roof vent pipes
  • Identify and eliminate all sources of standing water around your property.

For more information or to report mosquito problems visit the District’s website at
Recent West Nile virus activity in Marin and Sonoma counties
2011: 1 mosquito pool
2010: No West Nile virus activity
2009: No West Nile virus activity
2008: 2 mosquito pools and 12 dead birds
2007: 1 human, 2 horses, 23 dead birds, 1 mosquito pool
2006: 1 human, 2 horses, 29 dead birds, 5 mosquito pools, 3 sentinel chickens, 1 dead squirrel
2005: 1 human, 1 horse, 92 dead birds
2004: 1 horse, 67 dead birds, 1 mosquito pool
The Marin/Sonoma Mosquito & Vector Control District is an independent, special district committed to protecting public health from mosquitoes and mosquito-borne disease. All programs and services are funded through property taxes and provided to all residents in Marin and Sonoma counties. For more information about us please visit our website at