Dead Bird Found in CV Tests Positive for West Nile Virus

A dead bird tested positive for West Nile virus last week near the Castro Valley Community Center on Lake Chabot Road. It is the state's first report of the virus this year, prompting officials to increase mosquito monitoring in the area and ask residents to take preventative measures.

“With spring here, we’ll start seeing more mosquitoes across the state,” says Alameda County Mosquito Abatement District (ACMAD) Lab Director Eric Haas-Stapleton. “The rain and sunshine we’ve had over the last three months create ideal conditions for mosquitoes to grow in standing water.” 

Haas-Stapleton said the dead bird was found on March 18. Lab tests confirmed the virus on March 20. 

ACMAD Public Education Officer Judith Pierce said the district is working with Alameda County Health officials, East Bay Regional Park District (EBRPD), and Hayward Area Recreational Park District (HARD) to track any further virus spread. 

“The bird may have contracted West Nile from several hundred miles away but ended up dying near the park,” Pierce told the Forum. “One of the first signs that the West Nile virus is spreading in an area is the presence of dead birds, and we appreciate the public’s help reporting it to our office if they see one.” 

There is no cure for the West Nile virus. It is transmitted to people and animals only through the bite of an infected mosquito and not by coming into contact with a dead animal. Approximately one in five people who are infected with West Nile virus will develop symptoms such as fever, headache, body aches, joint pains, vomiting, or rash. Less than one percent will develop a serious neurological illness such as encephalitis or meningitis. 

Those most at risk of serious complications are adults over 50 years old and people with compromised immune systems are at increased risk. Anyone who develops symptoms should seek medical care immediately. 

In addition to people, horses are very susceptible to West Nile virus and vaccines are available. Horse owners are advised to contact their veterinarians regarding timely vaccinations. 

Pierce said the best way to reduce the risk of West Nile virus is to prevent mosquitoes from developing in the first place, Pierce said.

“Residents can help by draining, treating, or covering any containers that hold water—or by contacting our district if there is standing water in their neighborhood,” Pierce said. 

She added that you can also protect yourself from mosquito bites by wearing long pants and long-sleeved shirts and applying insect repellent containing DEET, Picaridin, IR3535, or Oil of lemon eucalyptus.

If you see a dead bird, officials ask that you call the California Dead Bird Hotline, which can be reached by phone or online at https://westnile.ca.gov/report.php. 

For information about mosquitoes, West Nile virus, or to request any of the District services visit www.mosquitoes.org or call (510) 783-7744.