West Nile Virus Update

Release date: 
Aug 7

Cotati, CA.- The Marin/Sonoma Mosquito and Vector Control District received confirmation that two more dead birds have tested positive for West Nile virus; a Western Scrub-Jay from the City of Novato and a Steller's Jay from the City of Cloverdale. The Novato bird was collected from the vicinity of Charmaine Court and James Black Circle and the Cloverdale bird was collected from the vicinity of Hillside Drive and Hillside Court. 


"We are asking for the support and participation of the public in reporting potential breeding sites, especially neglected swimming pools," stressed Nizza Sequeira, Public Relations Director for the Marin/Sonoma Mosquito and Vector Control District. "By working together we can lessen the threat of West Nile virus and continue to make Marin and Sonoma counties a healthy place for all of us."


Backyard sources are the number one place mosquito production can be found. Mosquitoes need only a tablespoon of water to complete their life cycle, from egg to adult in approximately 5 to 7 days. Common backyard sources include bird baths, neglected swimming pools, broken water pipes, ponds, animal water dishes, fountains, and septic tanks. Mosquito problems can be reported by calling the District at 1.800. 231.3236 or online at www.msmosquito.com.


2015 West Nile virus activity:


Marin County: 2 dead birds have tested positive for West Nile virus


Sonoma County: 4 dead birds and 8 mosquito samples have tested positive for West Nile virus


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