On Wednesday, two new cases of West Nile virus were reported to the city of Plano Environmental Health Division. One case was reported by Collin County and another was self-reported, Environmental Health Manager Jim Dingman said. Both people associated with the case saw medical attention, Dingman said. In order to prevent more cases, environmental health crews will be spraying near the intersections of Spring Creek Parkway and Independence Parkway and at Cumberland Trail and Blue Ridge Trail, according to a city of Plano press release. Weather permitting, crews will spray tomorrow night starting around 9 p.m., Dingman said. The spray used is targeted for mosquitos and the risk to pets and humans is very minimal, Dingman said. However, he did recommend people and pets stay inside during this time. West Nile virus is spread through the bite of an infected mosquito, according to the Centers for Disease Control and Prevention. Most people infected do not show symptoms, but 20 percent of people have a fever and less than one percent of those infected develop serious neurological problems, Dingman said. In order to prevent West Nile virus, Dingman said people should use mosquito repellant with DEET, drain standing water and avoid dusk and dawn when mosquitos are most active. If people need to be out during these times, they should wear loose, light colored clothing, Dingman said.