Make no mistake, it will take months to test, produce and bring the therapies to clinics. But researchers hold out hope that these products — even if incompletely tested — might help to slow the illness. Margaret Chan is the Director-General of the World Health Organization (WHO), based in Geneva, Switzerland. Two weeks ago, she declared the current outbreak “a public health emergency of international concern.” That’s because it has gone on longer than any earlier Ebola epidemic. It has affected more people. And it still is not under control