More West Nile Virus Activity In Marin & Sonoma Counties

Release date: 
Jul 3
Cotati, CA -  The Marin/Sonoma Mosquito & Vector Control District announced today that four dead birds and a mosquito sample have tested positive for West Nile virus. Two dead birds tested positive for the virus in Sonoma County; one from Santa Rosa in the vicinity of Barnes Road and one from Sebastopol near Watertrough Road. In Marin County, one dead bird and a positive mosquito sample tested positive for the virus, both collected from Novato in the vicinity of School Road. The other positive dead bird from Novato was collected near Oak Park Drive. 
"The 4th of July holiday, in particular, is centered around outside activities, especially during dusk when mosquitoes are most active," said Nizza Sequeira, Public Relations Director for MSMVCD. "We are urging residents to take personal protection measures against mosquitoes by wearing long sleeves and long pants, and applying an effective insect repellent to exposed skin," said Sequeira.  


Repellents that contain an active ingredient which has been registered with the U.S. Environmental Protection Agency (EPA) have been proven to be most effective when applied according to the instructions on the label.  


When there is a need for both sunscreen and insect repellent, the Centers for Disease Control (CDC) recommends using two separate products rather than a dual purpose one, as repellents do not need to be reapplied as often as sunscreen.


The Marin/Sonoma Mosquito & Vector Control District, in accordance with the CDC, recommends repellents that contain one of the following active ingredients:

  • DEET
  • Picaridin (PMD)
  • Oil of Lemon Eucalyptus
  • IR3535

Simple ways to help reduce exposure to mosquitoes:

  • Eliminate standing water in rain barrels, old tires, buckets, kiddie pools or any other item that can hold water for more than a week.
  • Report mosquito problems, neglected swimming pools, or any area that could be producing mosquitoes.
  • Stock backyard ponds or other permanent water features with mosquitofish. The fish are free and can be delivered or simply picked up at the District office.
  • Report dead birds to the West Nile virus hotline at 1-877-968-2473.
  • 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.


For more information or to report mosquito problems contact the Marin/Sonoma Mosquito and Vector Control District at 1.800.231.3236 or visit


Report dead birds to the West Nile virus Hotline at 1-877-968-2473 or online at