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Dr. Leslie Lobel, Dr. Seema Yasmin, and Dr. Xand van Tulleken weigh in on whether we should be farther along in our knowledge about Ebola.
Elizabeth Cohen reports from Dallas, where Ebola patient and nurse Nina Pham's condition has been upgraded to 'good.'
With airstrikes only doing so much damage to ISIS, is the U.S. about to change its strategy? Barbara Starr reports.