ABU DHABI: The world has made “tremendous progress” in combatting the deadly Ebola virus, the United Nations’s World Health Organization (WHO) chief told Agence France-Presse on Wednesday (Thursday in Manila). Margaret Chan’s remarks come almost a week after the WHO announced that the death toll from the world’s largest Ebola outbreak had topped 10,000. Most of the deaths in the outbreak, which began in late 2013, have been in the West African nations of Sierra Leone, Guinea and Liberia. But “Liberia has not reported a new case of Ebola for more than 10 days and we just need to keep going,” said Chan. Sierra Leone has “made tremendous progress” and, despite “some flare up” in Guinea, “we are working very closely to support President Alpha Conde and his team to get to zero” infections, Chan said on the sidelines of a conference in Abu Dhabi.