WHO: Ebola virus 'still running ahead of us'

Efforts to bring the Ebola outbreak under control are being outpaced by the virus itself, according to the head of the World Health Organisation.

Speaking to the BBC, Dr Margaret Chan warned against complacency, and admitted her organisation was initially slow to respond to the crisis.

More than 6,000 people have died from the virus in West Africa alone.

The BBC's global health correspondent Tulip Mazumdar reports.