"Our people are dying," said President Ernst Bai Koroma, speaking by video from Sierra Leone to an Ebola summit at the annual meeting of the International Monetary Fund and World Bank in Washington.
He described devastating effects of "this evil virus" children made orphans, doctors and nurses killed, an overwhelmed medical system that can't keep up with the need.
United Nations Secretary-General Ban Ki-Moon called for a 20-fold surge in international aid to fight Ebola.
"For those who have yet to pledge, I say please do so soon," he said. "This is an unforgiving disease."
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At the meeting here, President Alpha Conde of Guinea made an urgent plea for money, supplies, medicine, equipment and training of health care workers.
"Our countries are in a very fragile situation," Conde said through a translator. President Ellen Johnson Sirleaf of Liberia also appeared by videoconference to seek a rapid increase in aid.
Kim also said that more hospitals and local health centers must be built quickly to ensure that West Africans have faith that they can get the care they need in their own community, and no longer fear that Ebola centers are places that people go to in order to die.