As health authorities remain on alert, World Health Organization (WHO) vaccine experts on Friday recommended a full-scale human trial…... The number of confirmed Ebola cases in the Democratic Republic of the Congo (DRC) has surpassed 4,000, according to government data, as the world’s second-largest outbreak shows no sign of slowing. On Friday, the WHO recommended the commencement of full-scale human trials for the Ervebo vaccine, the only licensed Ebola vaccine. “This is already the largest Ebola outbreak in DRC’s history, and could well become the largest outbreak ever,” said Gavi chief executive Sania Nishtar. “Given the terrible toll on communities and frontline workers, we are encouraged that the approved Ebola vaccine Ervebo … could help reduce severe illness and deaths.”