The head of the Centers for Disease Control and Prevention warned Monday that other U.S. hospital workers may have Ebola after a Dallas nurse tested positive for the virus, as he vowed to "double down" on training for health care workers -- raising questions about whether he told the truth when he initially assured the public and Congress that U.S. hospitals are capable of treating Ebola patients. Thomas Frieden, at a press briefing on Monday, said the CDC would be taking a number of steps including offering more training and outreach throughout the health care system. He said they need...