As curious onlookers snapped photos, an emergency vehicle slowly rolled onto the grounds of Atlanta's Emory University Hospital. After days of traveling from Liberia, an Ebola-stricken Nancy Writebol was wheeled out on a stretcher. Writebol now joins Doctor Kent Brantly, who arrived on Saturday, to be treated for the deadly disease. The two had been working at a Monrovia treatment center run by several aid groups. Bruce Johnson represents one of those groups.