Health & Medicine

West Nile virus activity remains high in several area communities

The risk of West Nile virus in the Sacramento region remains high, officials say.

The Sacramento-Yolo Mosquito & Vector Control District received confirmation Wednesday that 15 new mosquito samples tested positive for the virus throughout the two counties.

“Virus activity continues to be intense,” district manager Gary Goodman said in a statement. “While activity is not uncommon during the summer, we are seeing an increase in the overall abundance of mosquitoes collected in our traps.”

Specific areas of concern, where much of the West Nile virus activity is concentrated, include North Highlands, Carmichael, Elk Grove and Fair Oaks. Goodman said the district is closely monitoring those areas to determine the best plan of action. More aerial spraying might be conducted next week, he said. Additional laboratory results will help determine whether further aerial treatments are needed.

In Yolo County, officials said, West Nile virus activity is up in Woodland and parts of Davis.

This year, 188 mosquito samples and 205 dead birds have tested positive for West Nile virus in Sacramento County, and 30 mosquito samples and 12 dead birds have tested positive for the virus in Yolo County.

The Placer Mosquito and Vector Control District announced Wednesday that 14 additional mosquito samples in Placer County had tested positive for West Nile virus, bringing the total to 26 this year. Three dead birds also have tested positive. As a result, district officials said they plan aerial spraying in agricultural areas in the western part of the county and ground-based treatments targeting smaller areas. Aerial spraying of the agricultural areas is scheduled from 8:30 to 10:30 p.m. Saturday.

In recent weeks, public health officials have tested 22 suspected human cases of West Nile virus statewide. None has been confirmed as a West Nile infection, according to the California Department of Public Health. The department continues to run confirmatory West Nile virus testing for other suspected cases of the virus in the state.

For more information on West Nile virus activity and planned ground and aerial treatments in Placer County, go to To request service for mosquito-related problems or to report dead birds, call 916-380-5444.

For more information or to report mosquito problems in Sacramento or Yolo counties, call the Sacramento-Yolo Mosquito & Vector Control District at 800-429-1022 or go to

Cathy Locke: 916-321-5287, @lockecathy