Thomas Eric DuncanThe first Ebola patient diagnosed in the United States died in a Dallas hospital Wednesday, a little more than a week after his diagnosis exposed gaps in the nation’s defenses against the disease and set off a scramble to track down anyone exposed to him. Thomas Eric Duncan, 42, was pronounced dead at 7:51 a.m. at Texas Health Presbyterian Hospital Dallas, where he was admitted Sept. 28 and had been kept in isolation, according to spokesman Wendell Watson. “Mr. Duncan succumbed to an insidious disease,” Watson said in a statement. Duncan carried the deadly virus with him from his home in Liberia, though he showed no symptoms when he left for the United States. He arrived in Dallas on Sept. 20 and fell ill several days later. His condition was downgraded during the weekend from serious to critical. More