A horse that has died from West Nile Virus is the latest in a string of animals, mostly birds, reported to have died from the disease. Human cases have been reported in Greene, Jefferson, Izard, Sebastian and Union counties, but no one has died this year from the virus. A Magnolia veterinarian says the horse tested positive for West Nile after an autopsy by the state Livestock and Poultry Commission. According to the state Health Department, birds have tested positive in 23 counties. A sentinel chicken has tested positive in Arkansas County. Mosquito pools have tested positive this year in eight counties. The virus is transmitted via mosquitos that feed on diseased birds. Humans affected don`t usually develop serious symptoms.