PUBLISHED ON JANUARY 19, 2006: A Matter of Numbers Experts say it's only a matter of time before an animal disease disaster strikes the unsecured U.S.-Mexico border By LEO W. BANKS Leo W. Banks Rancher John Ladd says the Border Patrol's Naco station, trying to be good neighbors, has sent out a four-man crew to make fence fixes along his borderland, farther from town. It's not much help. Leo W. Banks Dr. Gary Thrasher, a large animal vet in Hereford, near Sierra Vista, hesitates to name one disease, because there are so many. "I can give you a...