West Nile Virus Detected in Crows from Marin and Sonoma Counties

Release date: 
Oct 6
Cotati, CA. -The Marin/Sonoma Mosquito & Vector Control District has confirmed finding three more dead birds (all American crows) infected with West Nile virus (WNV)Two birds were collected in the vicinity of Stanford Ct. and Princeton Ave. in Sonoma. The other bird was found in the vicinity of Livingston Ct. and Martin Drive in Novato. These are the fourth and fifth WNV positive birds found in Sonoma County in 2017, and the first WNV positive bird found in Marin County this year.   

"Although fall is here, three dead birds have tested positive for West Nile virus in the last week", said Sarah Brooks, Lead Biologist for the Marin/Sonoma Mosquito and Vector Control District. "It's important that the public continues to report dead birds and take personal protective measures against mosquitoes." 
Vector control technicians are inspecting nearby sources of mosquito production as well as checking for new sources. Additional surveillance will continue to be conducted in the surrounding areas. 


  • Report mosquito problems or any area that could be producing mosquitoes at www.msmosquito.com 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 www.westnile.ca.gov. 
  • 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