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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.
WHO's latest update records 1,129 more confirmed cases in twelve days and a case fatality ratio of 48.1%. Transmission is now confined to Congo, across 60 health zones in six provinces.
The Bundibugyo virus epidemic is now the largest Ebola outbreak in Congo's history. WHO's emergency committee met again this week; MSF says the response still isn't reaching people fast enough.
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.
Two months after the emergency declaration, confirmed cases in DRC have passed 2,100 and spread to 46 health zones. There is still no approved vaccine or treatment — but patients are now being enrolled in one.
Eight confirmed cases, 246 suspected, and 80 suspected deaths in eastern DRC were enough for the Director-General to invoke his highest level of alarm — before convening the emergency committee that usually comes first.