Riverside County vector control officials plan to conduct anti-mosquito spraying Wednesday in Nuevo, covering a total 300 acres, to eradicate growing infestations that pose a potential risk to public health.

The Department of Environmental Health has scheduled “ultra-low volume” insecticide spraying between 5 a.m. and 7 a.m. in the following three locations:

— near Mystic Field, specifically the area around Lakeview and Magnolia avenues;

— between Reservoir and Lakeview avenues, west of Fifth Street;

— and between Ninth and 10th streets, west of Yucca Avenue.

According to Department of Environmental Health spokeswoman Dottie Merki, large concentrations of mosquitoes have raised concerns about the potential for West Nile virus being transmitted. A batch of mosquitoes netted in the area recently tested positive for West Nile, Merki said.

Anti-mosquito spraying involves the use of chemicals approved by the U.S. Environmental Protection Agency. Pesticides are emitted as a mist dispersed from machines anchored in the backs of pickup trucks.

Merki recommended that during operations, residents stay indoors and keep windows closed until at least 15 minutes after the trucks have departed.

No human West Nile infections have been documented in Riverside County this year. However, statewide, 19 infections have been recorded, the vast majority of them in Northern California, with one in Los Angeles County, according to the California Department of Public Health.

Mosquitoes typically become carriers of the virus after feeding on an infected bird and can then spread the potentially lethal strain to animals and humans. Those at greatest risk include seniors and individuals with compromised immune systems.

Symptoms may never materialize, but can include fever, headache, nausea, body aches, skin rashes and swollen lymph nodes.

Mosquito season in Southern California generally spans May to October. To reduce exposure to mosquitoes carrying West Nile, residents are urged to:

— spend as little time as possible outdoors at dawn or dusk, when mosquitoes are generally on the move;

— wear long pants and long-sleeved shirts during outdoor activity in mosquito-prone areas;

— use insect repellent;

— ensure door and window screens are fitted properly to keep bugs out; and

— get rid of standing water, aside from pools properly treated with chemicals.

Anyone with concerns should contact the Department of Environmental Health at 951-766-9454.

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