REDWOOD CITY (CBS SF) — San Mateo County’s Mosquito and Vector Control District detected West Nile virus in a dead bird this week, the first case in the county since 2018.
The bird — an American crow — was collected in South San Francisco earlier this week, the vector control district said Wednesday. Though reports of dead birds indicate the presence of the virus, the risk to humans remains low.
West Nile virus primarily affects birds, but humans, horses and other animals can get infected if bitten by an infected mosquito, which are vectors for the virus. The virus cannot be spread person to person.
The county’s vector control district encouraged people to report fresh bird carcasses to the California West Nile Virus Hotline at www.westnile.ca.gov or by calling (877) WNV-BIRD.
People can reduce the risk of infection by preventing mosquito breeding and avoiding mosquito bites. Since mosquitoes lay their eggs on standing water, the district recommends draining and eliminating sources of standing water on properties — including flower pots, old car tires, clogged gutters and pet bowls.
District officials also recommend wearing clothing and mosquito repellent when outside during early morning and evening hours, as these are times the mosquitoes that transmit the virus tend to bite. Doors and windows should have tight-fitting screens to keep mosquitoes out. Mosquito repellent containing ingredients such as DEET, picaradin, oil of lemon eucalyptus, or IR3535 can prevent mosquito bites.
The district will continue to treat mosquito breeding sources and collect mosquitoes for testing in areas where dead birds are found.
For assistance with a mosquito problem, people can contact the district at (650) 344-8592 or visit http://www.smcmvcd.org for more information.
West Nile virus has also been found in Contra Costa and Santa Clara counties this year.
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