The UN agency said it had now shifted its efforts in Guinea, Liberia and Sierra Leone, the countries worst-hit by the virus, from slowing the spread of the virus to ending the epidemic.
UN Ebola coordinator David Nabarro nevertheless cautioned that the epidemic was still not totally contained.
"The number of cases is decreasing week by week and getting to zero in many places... But we still see occasional flare-ups and we still see some surprises with new cases out of our contact lists," Nabarro told AFP.
According to the WHO figures released in Geneva, only 99 new cases were confirmed in the week up to January 25, the first time the figure has dropped below 100 since June 2014.
"The response... Has now moved to a second phase, as the focus shifts from slowing transmission to ending the epidemic," the WHO said in a statement.
"To achieve this goal as quickly as possible, efforts have moved from rapidly building infrastructure to ensuring that capacity for case finding, case management, safe burials, and community engagement is used as effectively as possible."
The three nations have been devastated by the outbreak, which began in December 2013, but all have seen recent signs that the virus is on the wane, with the number of new cases dropping weekly.
Liberia, once the country worst hit by the outbreak, hopes to have no new cases by the end of next month.
"We must maintain the effort with even greater intensity, the forthcoming rainy season is a concern," Nabarro said.
The World Health Organization admitted earlier this month that the UN agency had been caught napping on Ebola and pledged reforms to avoid similar mistakes in future.
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