UNITED NATIONS, Sha'ban 16, 1436, June 03, 2015, SPA -- Secretary-General Ban Ki-moon warned Tuesday that as long as there is one Ebola case in West Africa "all countries are at risk" and urged all nations to support the final battles to wipe out the deadly disease in Sierra Leone and Guinea, according to AP. "We are on the home stretch now and what happens now is critical," the U.N. chief told a General Assembly meeting on efforts to end the Ebola epidemic that has killed over 11,100 people mainly in Liberia, Sierra Leone and Guinea since it was first reported in March 2014. Liberia, once the worst affected country, is now Ebola free, but Ban warned that in Sierra Leone and Guinea "the battle has not yet been won" and "any lapse in vigilance could allow the virus to spread." Dr. David Nabarro, the U.N. Ebola chief, told the assembly that the priority is to ensure the outbreak ends as soon as possible "which will take several weeks and may take a number of months." "But everybody should be ready in case the disease recurs and needs to be controlled, especially in the coming 12 months," he said. --SPA 03:07 LOCAL TIME 00:07 GMT www.spa.gov.sa/w