The San Mateo County Mosquito and Vector Control District conducted a fogging abatement treatment to kill off mosquitoes found with the West Nile virus at two sites in San Mateo from 11 p.m. Monday to 5 a.m. Tuesday.
The district fogged a half-mile radius around two detection sites with zip codes 94401 and 94028, which is roughly bounded by Peninsula and Tilton avenues and El Camino Real to North Humboldt Street.
The district detected adult mosquitoes carrying the West Nile virus on July 18 and treated with the chemical Pyrenone 25-5, which evaporated by the morning, according to the district.
The district had previously sprayed in the neighborhood in late June, but the recent discovery is slightly north and some of the areas previously noticed were not fogged.
To avoid mosquito bites, residents should drain any standing water and wear proper clothing and repellent, particularly during dawn and dusk when mosquitoes are most active.
If anyone notices a bird or squirrel carcass, they should report it to the West Nile virus hotline at www.westnile.ca.gov or call (877) 968-2473.
For more information about the fogging abatement treatment call the district at (650) 344-8592.