David Brown with the Sacramento-Yolo Mosquito and Vector Control District says that means the risk of virus transmission to humans is higher. He says there’s no need for aerial insecticide spraying yet, but that could quickly change.
"Obviously if it continues to expand any much longer we may be considering aerial applications and people need to be prepared for that but we’re hopeful we can keep the populations down low enough so that we don’t have to do that."
Brown says as a precaution, use insect repellent and get rid of standing water around your home. So far this year, no humans have tested positive for West Nile virus in Sacramento County. Last year, 16 people caught the disease.