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.
A vast network of over 5,000 fraudulent online pharmacies has been found, and they're selling in the UK.
Owners said it might have found the coke at a friend's house.
The cause of Martha Nolan's death has still not been discovered.
Parents have been asked to stop their children wearing the dresses immediately.
He was confirmed dead at the scene.
Conor O'Rourke received specialist surgery in what's thought to be a world first.
'It felt like forever waiting for the kids to get home from school so I could break the news.'
KwaZulu-Natal Health MEC Nomagugu Simelane has called for urgent road safety measures after a provincial ambulance was involved in a serious accident on the N2 highway, outside Richards Bay, on Saturday.
A Serbian politician suffered a stroke on live television, shocking presenters as his face drooped and he began to slur his words.
A furious farmer who showered hundreds of campers with smelly fertiliser after they set up on his field in France has defended his actions.
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