Dr Tedros Adhanom Ghebreyesus said it was moving faster than any previous one and had a high risk of spreading to other countries in the region.
READ MOREFear of Ebola is keeping pregnant women away from healthcare facilities in eastern Democratic Republic of Congo, raising the risk of stillbirths, premature births and maternal deaths as the country's deadliest Ebola outbreak continues to disrupt routine medical care.
Responders are warning the deadly haemorrhagic virus is spreading at an unprecedented rate, outpacing efforts to slow it in the remote eastern part of the country.
Craig Bloomer was visiting the Greek island of Corfu when he died.
The vaccine could avert 100,000 cases of the disease.
'This is an incredibly sad situation and will undoubtedly be felt throughout the community.'
Three were arrested on suspicion of manslaughter by negligence.
Eight children were taken to hospital after falling unwell at the camp in Stathern, Leicestershire, on Sunday.
If you have bought the affected product, do not eat it.
And the poorest children are the worst affected.
She began feeling unwell months after the scratch.
A person in the video appears flat out unconscious on the floor.
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