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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.
Blood samples from a West African vaccine trial show both licensed Ebola vaccines generate antibodies that bind Bundibugyo virus — the species with no vaccine of its own, now causing DRC's largest outbreak on record.