American contracted Ebola in Democratic Republic of Congo, CDC says

An American tested positive for Ebola after being exposed while working with a medical missionary group in the Democratic Republic of Congo, US officials said on Monday. The American is being evacuated to Germany for treatment after developing symptoms over the weekend, said Dr Satish Pillai, Ebola response incident manager with the US Centers for Disease Control and Prevention (CDC). At least 100 deaths have been reported in an Ebola outbreak in the DR Congo, with more than 390 cases suspected, the head of the Africa Centres for Disease Control and Prevention told the BBC. The CDC said it is working to evacuate at least six other Americans who were exposed. The medical missionary group, Serge, said on Monday that one of its American doctors, Peter Stafford, had tested positive for Ebola after being exposed while treating patients at Nyankunde Hospital in Bunia in the Democratic Republic of Congo. Two others doctors from the group who were exposed while treating patients, including Stafford's wife, do not have symptoms and are following quarantine protocols, the group said in a statement. What is Ebola and why is stopping this outbreak so difficult?Also on Monday, the CDC issued a new order blocking foreign travelers from entering the US if they have visited a country affected by the outbreak in the past 21 days, including the DR Congo, Uganda and South Sudan.