WHO spokesman Tarik Jasarevic attributed the steep hike in fatalities, mainly in Liberia, principally to "a reconciliation of historical numbers" and not to new deaths in recent days.
Given the difficulty in collecting figures, the agency has previously said it believes there have been far more deaths than those registered.
The deadliest Ebola outbreak ever has so far hit Liberia the hardest, although observers say the spread of the virus there has slowed significantly in recent weeks.
Nonetheless, Liberia accounts for the lion's share of the new deaths tallied, now standing at 4,181 out of 7,244 cases.
Given the difficulty in collecting figures, the agency has previously said it believes there have been far more deaths than those registered.
The deadliest Ebola outbreak ever has so far hit Liberia the hardest, although observers say the spread of the virus there has slowed significantly in recent weeks.
Nonetheless, Liberia accounts for the lion's share of the new deaths tallied, now standing at 4,181 out of 7,244 cases.