The Idaho Department of Agriculture says another horse has been infected with the highly contagious Equine Herpes Virus-1, bringing the number of confirmed cases in the state to seven horses.  The department reported Sunday that the Bonneville County horse tested positive for the disease, and that it was only showing mild symptoms and was expected to recover.  The Post Register reports that the animal was a stable-mate of horses that traveled to Ogden, Utah, for the Western National Cutting Championships several weeks ago. The event in Ogden, Utah is believed to be where the outbreak began.   The U.S. Department of Agriculture said last week that 75 confirmed cases of the disease have been reported in nine states. So far, 11 horses have died or been euthanized because of the disease.