The Ebola outbreak in West Africa will be over by August, the head of the UN Ebola mission told the BBC.
Ismail Ould Cheikh Ahmed admitted the UN had made mistakes in handling the crisis early on, sometimes acting "arrogantly".
A year after the outbreak was officially declared, the virus has killed more than 10,000 people.
The medical charity Medecins Sans Frontieres said a "global coalition of inaction" led to tragic consequences.