Marin's First Case of Avian West Nile Virus in 2013 Found in San Anselmo

An American crow found dead near Redwood Road and Floribel Avenue in San Anselmo has become the first bird in Marin in 2013 to test positive for West Nile virus, according to the Marin/Sonoma Mosquito and Vector Control District.

"The positive dead bird is a reminder that West Nile virus continues to be a threat, not only to humans but also to wildlife, such as birds," district spokesperson Nizza Sequeira said in a statement.

The bird was sent to the district for testing May 29.

In 2012, 1,644 birds tested positive for the virus in California, while there were 479 human cases reported throughout the state. 

West Nile virus is a mosquito-borne disease that is spread by the bite of an infected mosquito. Mosquitoes become infected when they feed on infected birds. Infected mosquitoes can then spread the disease to humans and other animals.

According to district officials, approximately 20 percent of people infected with West Nile virus experience symptoms that may include fever, headache, body aches, nausea, rashes, swollen lymph nodes and vomiting. Less than 1 percent of people infected with West Nile virus develop serious illness; these cases may last for extended periods and result in permanent neurological damage may be fatal.   

The district recommends the following ways to help reduce the threat of WNV: 

• 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.