Health officials say 35 new Ebola cases have been reported with in Guinea and Sierra Leone in the past two weeks.
This is 4-times the figures seen just weeks before.
World Health Organization Director-General Margaret Chan says the new stats are a reminder the virus will not go quietly.
"Our objective is: get to zero, maintain zero and early recovery of essential health services."
"The virus, in this case, Ebola, has shown us time and time again how easy it is for a single, cross-border traveller or a single unsafe burial to re-ignite transmission chains again."
Liberia, which was also inundated with Ebola cases over the past year, remains Ebola-free after the last cases were cleared earlier this month.
The WHO this week has announced the establishment of a 100 million dollar of contingency fund to deal with future pandemics.
