UPDATE 4-WHO hails 'triumph' as Merck's Ebola vaccine gets European green light

The world’s first Ebola vaccine was recommended for approval by European drugs regulators on Friday in a move hailed by the World Health Organization (WHO) as a “triumph for public health” that would save many lives. The vaccine, developed by U.S. drugmaker Merck & Co, is already being used under emergency guidelines to try to protect people against the spread of a deadly Ebola outbreak in Democratic Republic of Congo. It protects against the Zaire strain of the Ebola virus – the one that most commonly causes outbreaks.