Three more horses have become seriously ill in a barn on the Hawthorne backstretch, bringing to five the total number of animals afflicted with an as-yet undiagnosed sickness, according to Dr. Dawn Folker-Calderon, the state-employed veterinarian at Hawthorne.
But as of Tuesday afternoon the outbreak remained confined to horses stabled in Barn A, suggesting isolation protocols introduced Sunday might have kept the illness from jumping into Hawthorne’s general horse population.