This is the Bundibugyo variant. Current vaccines target the Zaire strain. Current violent conflict is a major driver of this current infection getting out of control, but there is no approved vaccine for it yet. Current vaccines for this variant are in human testing phase.
All of this is compounded by the fact that the WHO has only received 60% of it's international pledge to combat Ebola, with the United States specifically behind the most to their commitment by 70%.