A local veterinarian says a Smith County horse is the first confirmed case of West Nile Virus in the county.
A state of emergency has been declared in Dallas due to the number of cases there and at least 10 deaths.
Aerial spraying of mosquitoes is scheduled to begin across Dallas and most of its northern suburbs.
The scheduled Thursday night spraying of Dallas and 10 northern Dallas County suburbs is the first time the Dallas area has had such aerial spraying of insecticide in almost a half century.
County and city officials approved the spraying because of a growing West Nile virus epidemic that has infected more than 200 Dallas County residents and killed 10 of them. The Dallas County death toll accounts for the lion's share of the 14 West Nile deaths reported in Texas.
Tyler Paper will continue to follow this story and bring you the latest as it becomes available.
(The Associated Press contributed to this report.)
Updated Thursday, August 16, 2012 at 10:46 a.m. CDT