NEW : US official to CNN : The situation is a ` ` screw - up '' Dallas mayor : The team came into contact with up to 20 people . He says symptoms ' did not warrant admission ' last week . US official on CNN : ` ` They dropped the ball ''
NEW : U.S. official to CNN : The situation is a `` screw-up '' Dallas mayor : The patient came into contact with up to 20 people . Hospital says symptoms 'did not warrant admission ' last week . NIH official on hospital : `` They dropped the ball ''