With the UN having faced criticism for an allegedly slow response to the virus, Ban started the tour in Liberia, the worst-hit country, after flying in from Ghana, where the UN Ebola mission is headquartered.
He later travelled to Sierra Leone and was due to fly to Guinea, the other two worst affected countries, as well as Mali, which has not seen a new case for three weeks, completing one of the two incubation period. The country needs to be declared free of the virus.
"Today we have reason to be cautiously optimistic that this terrible outbreak can be defeated. The spread of the virus is slowing down in Liberia. Our response strategy is working." Ban said at a joint press conference with Liberian President Ellen Johnson Sirleaf on Friday.
He highlighted the international response and thanked health workers and military members who have travelled to the region to assist.

"We are committed to stand with you now as you face this merciless threat. We will be with you until the outbreak is under control and the country has recovered,” the UN Chief said.
Arriving later in Sierra Leone, Ban said, “Efforts must be made to get kids back in school, fields planted, and markets up and running again. Beyond halting Ebola, we need to build up health systems and other infrastructure that will forestall something similar occurring in the future."
Ban's visit comes a year after the outbreak began in Guinea and follows sharp criticism from non-governmental organizations that UN agencies like the World Health Organization have been too slow to respond.

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