* Marks first recorded outbreak in humans in West Africa
* Ebola kills up to 90 percent of those infected
(Raises death toll)
By Saliou Samb
CONAKRY, March 22 (Reuters) - Guinea has received confirmation that a mysterious disease that has killed up to 59 people in the West African country, and may have spread to neighbouring Sierra Leone, is the haemorrhagic fever Ebola, the government ...