A sign of the World Health Organization (WHO) is seen at the entrance of the UN specialised agency's headquarters on May 18, 2018 in Geneva. - An Ebola outbreak in the Democratic Republic of the Congo has a high risk of spreading internally, the World Health Organization warned ahead of a meeting on whether to declare it an event of international concern. (Photo by Fabrice COFFRINI / AFP)        (Photo credit should read FABRICE COFFRINI/AFP via Getty Images)