More than 20,000 people have been diagnosed with Ebola, and more than 7,800 have died of the virus, according to new data from the World Health Organization. The Ebola epidemic has worsened in western Africa, with dozens of new cases reported Monday along Liberia's border with Sierra Leone. And on Monday a health worker was diagnosed with Ebola in Scotlandafter returning home there from Sierra Leone, marking the first case of the virus diagnosed in Britain.
