Congo Gets 70,000 Ervebo Vaccine Doses for an Ebola Strain It Was Never Built to Fight

Congo just got a shipment of vaccine that might not even work against the virus it's meant to stop. The World Health Organization's own statement makes that clear.

The World Health Organization and its partners announced Thursday that the Democratic Republic of Congo will receive 70,000 doses of the Ervebo vaccine, according to the Associated Press. Twenty thousand of those doses go into a Phase 3 clinical trial. The remaining 50,000 go straight to front-line health workers, per WHO's recommendation.

Ervebo is licensed for Zaire ebolavirus, the strain behind the 2014-2016 West African epidemic that killed more than 11,000 people, according to the UN News service. The outbreak currently tearing through eastern Congo is caused by a different species entirely: Bundibugyo virus. There is no approved vaccine for it.

WHO said plainly in its statement, cited by both the AP and the New York Post, that it does not know whether Ervebo will protect against Bundibugyo. "Early laboratory and animal data suggest it may provide some protection," the agency said. That is the evidence base right now for handing this vaccine to tens of thousands of health workers.

NPR's Jonathan Lambert reported that Africa CDC officials are moving ahead anyway, because the alternative is doing nothing while the outbreak outruns them. Placide Mbala, director of clinical trials and science at Africa CDC, told NPR that "only the public health measure will not be enough to quickly control or stop this outbreak." Mbala said the first trial could start within two or three weeks.

Ervebo has a real track record. It worked against Zaire ebolavirus. But betting on cross-protection against a different species, before the trial data exists, is a gamble born of desperation rather than confidence. WHO Director-General Tedros Adhanom Ghebreyesus called the shipment "an important example of global solidarity in action." At the same time, a purpose-built Bundibugyo vaccine is likely months away, according to NPR.

The numbers explain the urgency. As of Wednesday's data cited by UN News, the outbreak had killed 2,325 people and infected more than 5,000, with the New York Post and local station outlets updating the toll to 2,476 deaths out of 5,208 confirmed cases. The case fatality rate sits at 47.5% overall, and hits 70% in North Kivu province, where the response is hardest to run.

Africa CDC Director Jean Kaseya told NPR that contact tracing is the single indicator that matters most, and right now 70% to 80% of new cases are showing up outside any known contact list. That means responders are chasing a virus they can't see coming. Kaseya said officials need 25,000 to 30,000 more contact tracers than they currently have.

Heather Kerr, country director for the International Rescue Committee in Congo, told NPR that contact tracers face real resistance on the ground. Some residents doubt Ebola is even real. Others are angry that outside responders show up only for Ebola and ignore every other health problem in the region. This is a predictable response to years of underinvestment in basic health infrastructure suddenly getting a flood of attention only when a headline-grabbing virus shows up.

The conflict between Congo's government and the Rwanda-backed M23 armed group has blocked medical teams from reaching outbreak zones, forced the closure of health centers, and displaced thousands, making contact tracing and safe burials "nearly impossible" in some areas, according to UN News. M23 has reportedly set up its own parallel health administration in territory it controls and, per UN News, announced it would suspend shared taxi and boat travel to government-held Ebola zones. The UN has sanctioned M23 and documented what it calls atrocities against civilians, including mass killings and sexual violence, according to "numerous reports, investigations and testimonies" cited by UN News.

Experts believe the virus started spreading from the mining town of Mongbwalu as early as February, months before the outbreak was officially declared on