A global military intervention is needed to curb the largest ever Ebola outbreak, according to the medical charity Medecins Sans Frontieres.

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In a damning criticism of world leaders, it says the global response has so far been "lethally inadequate".

The charity said countries were turning their back on West Africa and merely reducing the risk of Ebola arriving on their shores.

More than 1,550 people have died in the outbreak which started in Guinea.

At least 3,000 people have been infected with the virus, but the World Health Organization (WHO) has warned that more than 20,000 people are likely to be infected.

'Coalition of inaction'

In a speech to the United Nations, the international president of MSF, Dr Joanne Liu, said repeated calls for help had been ignored.

She said: "Six months into the worst Ebola epidemic in history, the world is losing the battle to contain it.

"Leaders are failing to come to grips with this transnational threat.

"The WHO announcement on August 8 that the epidemic constituted a 'public health emergency of international concern' has not led to decisive action, and states have essentially joined a global coalition of inaction."

MSF said military and civilian teams capable of dealing with a biological disaster were needed immediately as the spread of Ebola "will not be prevented without a massive deployment".

It is calling for more field hospitals with isolation wards to be set up, trained healthcare workers to be sent to the region and air support to move patients and medics across West Africa.

Dr Liu added: "States with the required capacity have a political and humanitarian responsibility to come forward and offer a desperately needed, concrete response to the disaster unfolding in front of the world's eyes.

"Rather than limit their response to the potential arrival of an infected patient in their countries, they should take the unique opportunity to actually save lives where immediately needed, in West Africa."

The charity said that at one site in Monrovia, in Liberia, it had been able to set up an isolation facility with 160 beds, but said they were "overwhelmed" with growing queues and needed an additional 800 beds.

Source: BBC