(AGI) Geneva, Sept 16 - The Ebola virus outbreak has killedmore than 2,500 people in West Africa where 5,000 have beeninfected, the World Health Organisation said on Tuesday. Theorganisation described the crisis as "unparalleled in moderntimes". David Nabarro, Senior United Nations System Coordinatorfor Ebola, said the governments of the nations involved(Liberia, Sierra Leone, Guinea and Nigeria) have made massiveefforts to curb the spread but more help is needed toeffectively respond to the Ebola threat. U.N. Secretary GeneralBan Ki Moon will launch a "global response coalition" in NewYork on Thursday. (AGI) . .