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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.'
CDC Director Thomas Frieden discusses the latest Ebola crisis developments, including the Dallas nurse who is infected and NBC's Nancy Snyderman, who is in hot water after violating her quarantine. Full story