Speaking on a video call from the Congolese city of Bunia, Harneis called for more aid, saying an existing pool of funds is set to run out within weeks.
Health workers there were coming under attack by locals angered and terrified by the outbreak, he said, adding that some 160 healthcare workers have fallen ill with Ebola, and 43 of them have died.
Harneis said aid cuts in recent years have reduced the capacity of humanitarian organizations.
