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Two dead birds recently located in Pleasanton tested positive for West Nile virus, according to the Alameda County Mosquito Abatement District.
While a group of mosquitoes tested positive for the virus in the beginning of the year, the dead birds found on May 31 represent the first indication of active virus transmission in Alameda County in 2023, district officials said. The exact location of the discovery was not released.
"This local virus positive detection by our laboratory staff reminds the public West Nile virus is endemic in our community and the best way to stop any future transmission is by decreasing the numbers of mosquitoes," General Manager Ryan Clausnitzer said in a statement.
"As the entire region has noticed, we have had far more rain this year than we had for many years and excess standing water creates more opportunities for mosquitoes to produce," Clausnitzer added.
The district has increased mosquito monitoring and larval control effects throughout the area where the dead birds were discovered, officials said. Efforts are being made to track down areas of standing water where mosquitoes may breed, but not limited to catch basins, storm drain systems and swimming pools.
Dead birds also play a vital role in the district to monitor West Nile virus transmission activity in Alameda County. Public reporting on dead birds is important for its surveillance program, officials said.
There have been no human cases of West Nile virus reported as of 2023, according to the California Public Health Department.
The virus can be transmitted to humans through the bite of an infected mosquito, and there is no cure for the virus. Those who are infected with West Nile virus may develop mild symptoms such as fever, headache, joint pains, rashes or vomiting. Less than 1% of people may develop meningitis or encephalitis.
According to the district, residents can reduce the risk of West Nile virus and other mosquito diseases by dumping standing water on their property because mosquito larvae thrive in; limit outdoor activities during dusk and dawn, which are peak mosquito hours; wear long pants and long-sleeved shirts and spray on EPA-registered mosquito repellent; and check all window and door screens do not have any tears or holes.
To find out more about mosquitoes, West Nile virus or to request district services, visit www.mosquitoes.org or call 510-783-7744. For information regarding virus symptoms, prevention and testing, contact the Alameda County Public Health Department at 510-267-8001.
