By Donald Stotts  STILLWATER, Okla. – Horses account for about 97% of reported non-human mammalian cases of West Nile virus encephalitis, according to the American Association of Equine Practitioners, underscoring the need for horse owners to employ sound animal-health-management strategies.  West Nile virus can cause encephalitis, which is inflammation of the brain. The virus can also cause meningitis, an inflammation of the lining in the brain and spinal cord, in people and horses. The…