The city of Plano has identified this year's second human case of the West Nile virus in city limits and will spray for mosquitoes in two neighborhoods.

The city announced Wednesday that sprayings are scheduled to start at 9 p.m. Thursday in a western neighborhood located northeast of Parker and Midway roads, and another on the far-eastern side of town near the intersection of 14th Street and Plano Parkway.

The city advises residents near these neighborhoods to keep pets and children indoors during the sprayings.

The city regularly traps mosquitoes throughout the city to test them for disease and inform population control efforts. City employees have seen a significant spike this year in the number of mosquitoes per trap, staff told Plano City Council members Monday.

Although humans rarely contract West Nile virus—states reported fewer than 2,000 human cases to the Centers for Disease Control and Prevention in 2016—it can be life-threatening for the 1 percent of human cases that result in a serious neurological condition. People age 60 and older bear the most risk from the disease, according to the agency.

For detailed boundaries of the spray areas, zoom in on one of the red zones in the map below.