Kinshasa, Congo — Limited access and required funding are the key challenges facing health officials trying to respond to the latest Ebola outbreak in southern Congo, the World Health Organization said on Friday.

It is the first Ebola outbreak in 18 years in Kasai province, a remote part of Congo with poor road networks, which is more than 1,000 kilometers (621 miles) from the nation’s capital of Kinshasa.

A United Nations peacekeeping helicopter was used to help deliver 400 vaccine doses to the epicenter, in the locality of Bulape, on Friday, Patrick Otim, WHO's program area manager, said at a briefing in Geneva.

An additional 1,500 doses will be sent from the capital of Kinshasa, he said.

“We have struggled in the last seven days with access but are collaborating with MONUSCO (U.N.

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