"Nearly everyone involved in the outbreak response failed to see some fairly plain writing on the wall," WHO said in a draft internal document obtained by The Associated Press, noting that experts should have realised that traditional containment methods wouldn't work in a region with porous borders and broken health systems.
The UN health agency acknowledged that, at times, even its own bureaucracy was a problem. It noted that the heads of WHO country offices in Africa are "politically motivated appointments" made by the WHO regional director for Africa, Dr Luis Sambo, who does not answer to the agency's chief in Geneva, Dr Margaret Chan.
"It's the regional office in Africa that's the frontline," he said. "And they didn't do anything. That office is really not competent."
Piot also questioned why it took WHO five months and 1,000 deaths before the agency declared Ebola an international health emergency in August.
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"I called for a state of emergency to be declared in July and for military operations to be deployed," he said. But he said WHO might have been scarred by its experience during the 2009 swine flu pandemic, when it was slammed for hyping the situation.
WHO said it was "particularly alarming" that the head of its Guinea office refused to help get visas for an expert Ebola team to come in and USD 500,000 in aid was blocked by administrative hurdles. Guinea, along with Sierra Leone and Liberia, is one of the hardest-hit nations in the current outbreak, with 843 deaths so far blamed on Ebola. The Ebola outbreak already has killed 4,484 people in West Africa and WHO has said within two months, there could be new 10,000 cases of Ebola every week.