Lambton Public Health has begun larvaciding catch basins.
Supervisor Lori Lucas says the process help control mosquito larvae and reduce the incidence of West Nile virus.
She says larvaciding will continue into September in 16,000 catch basins across Sarnia-Lambton.
"Lambton residents are encouraged to watch for the employees treating the catch basins," says Lucas.
"The vehicles will be equipped with a rooftop yellow flashing light, west nile virus signs and makes frequent stops caution signs."
Lucas says residents are also encouraged to take precautions to prevent exposure to mosquitoes by eliminating breeding sites and standing water on their properties, and wearing insect repellent containing deet.
Lambton Public Health is also collecting dead birds for testing in an effort to tract the west nile virus.
Residents are asked to report sightings of all dead birds by calling 519-383-3824, toll free at 1-800-667-1839 or online at www.lambtonhealth.on.ca
West Nile can be passed to humans through an infected mosquito. A very small number of people will get sick but occasionally West Nile virus can cause encephalitis.
