For how we live.
The vaccines and antibody drugs that cut Ebola's death rate work against the Zaire species. None is approved for the Bundibugyo virus now driving the largest Ebola outbreak in Congo's history.
Ervebo was licensed against Zaire ebolavirus. WHO says it is not known whether it protects against Bundibugyo virus in humans — which is why a trial is running alongside the wider rollout.
The Bulape outbreak in Kasai Province ended 88 days after it was declared, with a case fatality ratio above 70% and nearly 48,000 people vaccinated.