WHO Uses Ebola Vaccine Against an Unapproved Strain in DR Congo

DR Congo's deadliest Ebola outbreak — over 2,500 dead — is driven by the Bundibugyo strain, which has no approved vaccine. The WHO is deploying Ervebo, cleared only for the Zaire strain, with 20,000 of 70,000 doses set for a late-stage trial. Animal studies hint at possible cross-protection, but no human efficacy data exists. Africa CDC warns cases could triple.