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Trabajadores de salud con equipo de protección preparan dosis de vacuna en una clínica de campaña en el este del Congo
Imagen alusiva: preparación de vacunas en una clínica de campaña durante el brote de ébola en el Congo. · EPM

Two Bundibugyo Ebola vaccines join the Tumaini trial in DR Congo

Two vaccines designed for the Bundibugyo species, ChAdOx1 and mRNA-1469, will join the Tumaini trial in Bunia after a WHO expert recommendation, during Congo's…

--- The context --- The Democratic Republic of the Congo has battled for nearly six months an Ebola outbreak caused by the Bundibugyo species, now the largest in the country's history. As of 1 November, there were more than 10,500 confirmed cases and 5,126 deaths. The response is concentrated in the east, where health teams work to interrupt transmission and protect the close contacts of each confirmed case, in a setting where speed and trust in the communities are decisive. --- The facts --- Two new vaccine candidates will be added to the Tumaini clinical trial. They are ChAdOx1, developed by the University of Oxford with the Serum Institute of India, and mRNA-1469, developed by Moderna. Their inclusion follows the recommendation of the WHO Technical Advisory Group on Candidate Vaccines Prioritization, which met this week and advised further clinical evaluation based on the available evidence. It will be the first time vaccines specifically designed for Bundibugyo are evaluated during an active outbreak. --- The positions --- WHO Director-General Tedros Adhanom Ghebreyesus said in attributed remarks that the fact that these vaccines are ready to enter clinical trials is a testament to the power of science and partnership. He also stressed, in indirect terms, that vaccines alone will not end the outbreak, although they could become a powerful new tool for bringing it under control. The message pairs recognition of scientific progress with a clear warning against expecting a single solution. The Tumaini trial, named after the Swahili word for hope, was launched on 23 October in Bunia, capital of Ituri province, which remains the epicentre. Ervebo, used against the Zaire species, is already being tested there to determine whether it is effective against Bundibugyo. The two new candidates will enter the trial following national approvals. --- What remains unknown --- Tumaini is designed to test multiple candidates within a single trial, using ring vaccination focused on contacts of people with confirmed Ebola Bundibugyo. Four vaccination rings have been set up and several more are being prepared, while research into other potential treatments also moves forward. The ring strategy was pioneered a decade ago during the West Africa outbreak, when a trial in Guinea established the efficacy of Ervebo. --- Unanswered questions --- Will ChAdOx1 and mRNA-1469 show clear protection against Bundibugyo under real outbreak conditions? How quickly will national approvals and new rings translate into meaningful coverage in Ituri? Can the trial keep pace if confirmed cases continue to rise in the coming weeks? --- EPM analysis --- The significance lies in testing vaccines built for this specific species, inside one coordinated protocol, where the outbreak is actually unfolding. That approach can produce answers grounded in the field and help direct scarce resources to the people at highest risk first, the contacts around each confirmed case, rather than dispersing efforts across disconnected studies. 📌 EPM Take: In EPM's view, adding ChAdOx1 and mRNA-1469 to Tumaini is a serious and measurable step against the country's largest Ebola outbreak, because it combines vaccines designed for Bundibugyo, ring vaccination and direct work in Bunia. It does not promise an immediate end, as WHO leadership itself warned, but it offers a concrete way to protect contacts and to learn, during the emergency itself, what truly works against this species in practice.
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