On December 22, the organization reported 19,340 cases of the disease in the three West African countries as of December 20, whereas on Tuesday WHO said that the number climbed to 19,431 as of December 21.
The death toll increased by almost 50 within the same period of time, and stood at 7,565, compared to previously reported 7,518.
The same day, UN Secretary-General Ban Ki-moon urged the international community to step up efforts to contain Ebola, as the virus kept evolving.
The current outbreak of the Ebola virus started in Guinea in December 2013, spreading to Liberia, Sierra Leone, Nigeria and Senegal in 2014, with several Ebola cases reported outside of West Africa.
There is no officially approved vaccine against Ebola. Several countries, including Russia, have started developing medication to fight the disease.
