The spectre of Ebola is everywhere in Monrovia. A brass band led more than 100 people down the street one recent afternoon publicizing how to combat the deadly virus. Many in the crowd wore T-shirts emblazoned with “Don’t be ashamed. Keep safe. Ebola is real.”Struggling to battle the stigma that Ebola carries, authorities have erected billboards around the city telling people how to avoid getting it or spreading it.