Ebola challenge 'biggest since HIV/Aids' - US

The Ebola outbreak in West Africa is unlike anything since the emergence of HIV/Aids, top US medical official Thomas Frieden has said.

A fast global response could ensure that it did not become "the next Aids," the director of the Centers for Disease Control and Prevention (CDC) said.

The presidents of Liberia, Sierra Leone and Guinea appealed for more aid to help fight the disease.

The outbreak has killed more than 3,860 people, mainly in West Africa.

More than 200 health workers are among the victims.

Elsewhere:

• The UK is investigating reports a Briton suspected of having the disease has died in Macedonia, though Macedonia's health ministry says there are "high chances" this is not a case of the disease

• Britain is to begin enhanced screening for Ebola in people travelling from affected countries, the government announces

• The US is introducing new security measures to screen passengers arriving from Ebola-affected countries in West Africa at five major US airports

• In Texas, a county sheriff deputy was quarantined after visiting the home of the first person diagnosed with Ebola on US soil, who later died from the virus

• The health of Spanish nurse Teresa Romero - who became the first person to contract Ebola outside of West Africa - has worsened, a hospital official says

Scientists are racing to understand - and combat - the Ebola virus

How not to catch Ebola

• Avoid direct contact with sick patients

• Wear goggles to protect eyes

• Clothing and clinical waste should be incinerated and any medical equipment that needs to be kept should be decontaminated

• People who recover from Ebola should abstain from sex or use condoms for three months

Why Ebola is so dangerous

How Ebola attacks

Ebola: Mapping the outbreak

'Our people dying'

At the meeting in Washington, Dr Frieden described Ebola as one of the biggest crises he had seen in his career.

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

The presidents of Liberia, Sierra Leone and Guinea - the three countries worst affected by Ebola - appealed for more aid.

"Our people are dying," Sierra Leone's leader Ernest Bai Koroma said, adding that the world was not responding fast enough as children were being orphaned.

On Thursday, a Liberian doctor died of the disease at a treatment centre in Monrovia, health officials said.

Ugandan-born John Taban Dada had been working at the country's largest hospital, the John F Kennedy Memorial Center, his former colleagues said.

His death brings to four the number of doctors who have died in Liberia since the outbreak.

Liberia has been one of the worst affected countries

Meanwhile, Ms Romero is now being helped with her breathing in hospital in Spain, according to her brother. Two doctors who treated her have also been admitted for observation.

Nigerian success?

The EU has announced plans for a system to evacuate international staff from Ebola-infected countries if they show signs of the disease.

The evacuation system will allow patients to be flown within 48 hours to European hospitals "that are equipped to deal with the disease," a statement from the European commission said.

The move is expected to make it easier to deploy European medical workers to combat the crisis in West Africa.

Nigeria's government says 200 healthcare workers have volunteered to be sent to Liberia, Sierra Leone and Guinea as part of a global response team on Ebola.

Nigeria, which has had seven confirmed deaths from the virus, seems to have successfully contained the spread of the haemorrhagic fever, the BBC's Chris Ewokor in Abuja says.