Two more Denton County residents have been diagnosed with West Nile virus, health officials said Tuesday.
The fourth and fifth human cases for 2017 in Denton County are from Frisco and Flower Mound. The Frisco resident was diagnosed with the more serious form of the disease, West Nile neuroinvasive disease, which usually requires hospitalization and can lead to permanent paralysis or death.
The Flower Mound resident was diagnosed with the less serious West Nile fever.
In addition, crews will be spraying overnight Wednesday, Thursday and Friday after more mosquitoes tested positive for West Nile in the Lantana area, near Argyle and Bolivar.
Denton County health officials announced the measure Tuesday morning, including a detailed map of spray locations on the county website. The website contains more information about how to prevent exposure and recognize symptoms of the illness.
Spraying is scheduled to begin each night at 9 p.m. and be completed by 5 a.m., weather permitting. Residents are encouraged to bring pets indoors and cover garden vegetables.
No mosquito trap has yet tested positive this year in the city of Denton, nor have any Denton residents been diagnosed with the illness.