The WHO says, the three countries hardest hit by the Ebola epidemic have recorded their lowest weekly number of new cases for months.
As the global death toll reached 8,429 out of 21,296 cases reported so far, Sierra Leone and Guinea both saw the lowest weekly total of confirmed Ebola cases since August 2014.
Liberia, which reported two days of zero new cases last week, had its lowest weekly total since June.
UN Secretary-General, Ban Ki-moon, had previously said the epidemic could be over by the middle of 2015.
However, WHO is now declining to set a specific timeline, after having been proved wrong on previous predictions.
A WHO Spokesperson said getting to zero cases will take time and effort, and that includes immediate treatment of patients and dignified, safe burials of the dead.
Sierra Leone President, Ernest Bai Koroma, predicted this week, that his country would be Ebola-free by WHO standards by May.
By WHO standards, a country cannot be declared Ebola-free until it has registered no cases, for 42 consecutive days.
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