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International pledges of deployments and aid for Africa's Ebola-hit regions have not yet had any impact on the epidemic, a major medical charity says, according to the BBC.

Christopher Stokes of Medecins Sans Frontieres (MSF) said the disease was still out of control.

He said it was "ridiculous" that volunteers working for his charity were bearing the brunt of care in the worst-affected countries.

The disease has killed about 4,500 people so far, mostly in West Africa.

MSF runs about 700 out of the 1,000 beds available in treatment facilities Liberia, Sierra Leone and Guinea.

The BBC's Mark Doyle, at the UN Ebola logistics base in Ghana, says it is generally agreed that at least three times that number are needed.

Donors have given almost $400m (£250m) to UN agencies and aid organisations, and there have been some high-profile offers of help from the international community, the correspondent says, for example the British army building a field hospital in Sierra Leone.

However, UN Secretary General Ban Ki-moon on Thursday made another urgent appeal for funds to help fight the disease, saying a $1bn trust fund he launched last month had received only $100,000.