RALEIGH — A total of 19 horses in nine counties have tested positive for equine infectious anemia (EIA). At this time, 17 horses have been euthanized to help prevent further spread. The counties include Duplin, Forsyth, Henderson, Mecklenburg, Randolph, Sampson, Surry, Yadkin and Wake. The majority of EIA positive cases have been associated with unsanctioned horse racing.