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Pandemics and Biosecurity
24AUG

Ebola drug trial awaits DRC, Uganda nod

3 min read
17:07UTC

WHO is sponsoring a trial of remdesivir and the antibody cocktail MBP134 for Bundibugyo Ebola, but it cannot dose anyone until the DRC and Uganda grant regulatory approval.

ScienceDeveloping
Key takeaway

The most promising Ebola therapeutic is stalled by national approvals that conflict is making harder to secure.

WHO is sponsoring a trial of two existing therapeutics for Bundibugyo Ebola: remdesivir, an antiviral, and MBP134, a monoclonal antibody cocktail (engineered proteins that bind and neutralise the virus) from Mapp Biopharmaceutical that is active across Ebola species 1. In animal studies MBP134 gave 100% protection even when given up to eight days after infection 2. The trial has not begun dosing; it awaits regulatory approval from the DRC and Ugandan governments 3. This trial is the concrete answer to the gap flagged when the emergency was declared, when WHO confirmed no licensed countermeasure exists for this species and its R&D Blueprint had already named the Bundibugyo therapeutic gap .

National regulators in the DRC and Uganda must clear an investigational protocol, secure informed consent and stand up trial sites before any patient is dosed, and those are exactly the functions that conflict and a torched clinic erode. A trial needs a stable site, a traceable cohort and a chain of custody for samples; the South Kivu crossing and the 21% tracing ceiling in Ituri make all three harder to guarantee. The therapeutic that could cut the fatality rate is gated behind administrative steps that the outbreak's geography is actively dismantling.

No Bundibugyo-specific vaccine has reached even Phase 1. A ChAdOx-platform candidate is two to three months from producing trial doses but lacks safety data; an rVSV-platform candidate is six to nine months out 4 5. ChAdOx and rVSV are the two viral-vector designs behind the Oxford COVID and licensed Zaire-Ebola vaccines. Roughly 2,000 doses of Ervebo, licensed only for Zaire ebolavirus, already sit in the DRC, and GAVI says they could be used in a trial if WHO experts judge it worth testing against a different species 6. Every route to a vaccine here is measured in months, not days.

Deep Analysis

In plain English

The most promising treatment being tested against this type of Ebola is MBP134, a cocktail of laboratory-made antibodies developed by a company called Mapp Biopharmaceutical. In animal studies, it protected 100% of infected subjects even when given up to eight days after infection. It also works against multiple types of Ebola, including Bundibugyo. The problem: it cannot be given to human patients yet because the governments of DRC and Uganda have not yet approved the trial. Clinical trials in outbreak conditions require oversight to protect patients, who may be too sick to give fully informed consent. A second antiviral, remdesivir (also used in Covid-19 treatment), is being trialled alongside MBP134. An Ebola vaccine designed for a different species, Ervebo, has about 2,000 doses stockpiled in DRC; scientists are debating whether to test it here, even though it was not made for this type of virus.

Deep Analysis
Root Causes

No licensed vaccine or treatment exists for Bundibugyo ebolavirus because the two prior outbreaks produced only 169 combined cases across 2007 and 2012, insufficient patient numbers and market incentive for a full regulatory trial programme.

Mapp Biopharmaceutical developed MBP134 under the US Department of Defense's medical countermeasures programme for filovirus threats, not through a commercial development pathway, which means compassionate-use access depends on US regulatory frameworks that cannot bind DRC or Uganda authorities.

The ChAdOx-platform Bundibugyo vaccine candidate being two to three months from trial doses reflects the same market-size problem: Oxford developed the platform using prior MERS and COVID-19 investments; the Bundibugyo-specific insert requires immunogenicity data that cannot be obtained without an outbreak. The outbreak has now arrived, but the trial cannot start before safety data that takes months to generate.

First Reported In

Update #4 · Ebola triples, response misfires

NBC News· 24 May 2026
Read original
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