Concerns about Ebola in the United States have grown after the second Texas nurse who contracted the virus reported the Centers for Disease Control had allowed her to board a plane from Ohio to Texas the day before she was diagnosed. The nurse, Amber Vinson, had called the CDC complaining of symptoms, but an official gave her the OK to fly. Two schools in Cleveland will remain closed today because a staff member may have traveled aboard the same plane. On Wednesday, Vinson was transferred to an isolation unit at Emory Hospital in Atlanta.