The Ebola outbreak raging through the Democratic Republic of the Congo is growing "exponentially," the United Nations warned on Friday, as the number of deaths from the virus passed 2,500. The Ebola outbreak is already the biggest in the country's history and is spreading faster than any outbreak on record. Key points and original sources are listed below.

• The Ebola outbreak raging through the Democratic Republic of the Congo is growing "exponentially," the United Nations warned on Friday, as the number of deaths from the virus passed 2,500.S1

• The Ebola outbreak is already the biggest in the country's history and is spreading faster than any outbreak on record.S2