As a deadly new Ebola outbreak kills dozens in southern Congo, health authorities and organisations are sounding the alarm, warning they lack the funds and resources to mount an effective response to the crisis.

The World Health Organisation said on Wednesday that 57 cases and 35 deaths have been reported since the outbreak was announced by Congolese authorities on September 4.

The fatality rate is over 61 per cent.

It is the first Ebola outbreak in 18 years in Kasai province, a remote part of Congo characterised by its poor road networks.

It is located more than 1000km from the nation's capital of Kinshasa.

"We urgently need our partners and donors to step up and support this lifesaving response to ensure we can contain the outbreak quickly and protect the most vulnerable communities

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