The Ebola virus has now claimed 4,477 lives according to the World Health Organisation (WHO).
The vast majority of deaths are in West Africa, but the disease has also claimed victims in Europe and the US.
WHO assistant director-general Bruce Aylward said there could be up to 10,000 new cases a week within two months if more is not done to stop the spread of the virus.
Sierra Leone, Liberia and Guinea are worst affected by Ebola, with 2,316 deaths in Liberia alone.
WHO: Ebola epidemic an international emergency (08 August 2014)