United Airlines, which flew Ebola victim Thomas Eric Duncan on two of the three flights that brought him to the U.S. last month, is trying to notify as many as 400 people who may have been on Duncan's flights, referring them to the U.S. Centers for Disease Control and Prevention, the airline told NBC News on Thursday. United said it doesn't believe any fellows passengers are at risk but that it was taking the move out of an abundance of caution.
Duncan became the first patient diagnosed with Ebola in the U.S. last month when he was admitted to a Dallas hospital after he flew into the country from Liberia via Belgium. United said it began getting in contact Wednesday with those fellow passengers for whom it had contact information and hoped to have reached them all in the next few days. Medical authorities said Duncan, 42, wasn't showing symptoms while he was flying, agreeing with United that there was virtually no risk to fellow fliers.
— M. Alex Johnson and Tom Costello