DALLAS — A Liberian Ebola patient was left in an open area of a Dallas emergency room for hours, and the nurses treating him worked for days without proper protective gear and faced constantly changing protocols, according to a statement released late Tuesday by the largest U.S. nurses’ union. Nurses were forced to use medical tape to secure openings in their flimsy garments, worried that their necks and heads were exposed as they cared for a patient with explosive diarrhea and projectile vomiting, said Deborah Burger of National Nurses United. Burger convened a conference call with reporters to relay what...