Ebola outbreak in Congo still in 'expansion phase', WHO says Reuters Congo Ebola outbreak death toll surpasses 500 as frontline workers threaten strike Yahoo News Canada Death toll from DR Congo Ebola outbreak passes 500 as healthcare workers threaten strike France 24 Ebola disease caused by Bundibugyo virus, Democratic Republic of the Congo & Uganda World Health Organization (WHO) Ebola death toll in DR Congo surpasses 500 Al Jazeera