The 2011 mosquito-borne disease season is in full swing as two Texas horses have tested positive for West Nile virus (WNV) in two different counties.

Jim Schuermann, staff epidemiologist for vectorborne and zoonotic diseases of the Zoonosis Control Branch of the Texas Department of State Health Services, said Aug. 18 that WNV was confirmed in a Grayson County and a Harris County horse.

"The infections were confirmed by the Texas Veterinary Medical Diagnostic Lab at Texas A&M University," he said. "The Grayson County horse survived, but the Harris County horse was euthanized."

Grayson County is located in Northeast Texas, and Harris County is in the Southeastern part of the state. No further information on the surviving animal’s condition was available

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