Texas Health Presbyterian Hospital Dallas is changing its infection control procedures in an effort to reduce the Ebola infection risk for its staff, said Dr. Tom Frieden, director of the Centers for Disease Control and Prevention. "We have to rethink the way we address Ebola infection control because even a single infection is unacceptable," Frieden said Monday during a national media briefing in Atlanta. The hospital announced Sunday that one of its critical care nurses was infected while treating Ebola patient Thomas Eric Duncan, who died Wednesday. The nurse was identified today as being Nina Pham, who now is isolated in a hospital intensive care unit.