Health officials in Dallas and Washington are feeling a bit better now that the 21-day monitoring period has passed for dozens of people who had contact with Thomas Eric Duncan before he was (belatedly) diagnosed with Ebola late last month. As of Monday, 43 of the 48 people on the original watch list had been told that they are no longer at risk of contracting the virus that killed Duncan and infected Nina Pham and Amber Vinson, two nurses who cared for him at a Texas hospital.