Ebola challenge 'biggest since Aids'

The world needed to work fast so it did not become" the next Aids", the director of the Centers for Disease Control and Prevention (CDC) said.

Dr Frieden was addressing a high-level World Bank forum about the crisis.

The outbreak has killed more than 3,860 people, mainly in West Africa, including more than 200 health workers.

Earlier this week, a Spanish nurse became the first person to contract the deadly virus outside Africa.

"I would say that in the 30 years I've been working in public health, the only thing like this has been Aids," Mr Frieden said.