Congo starts Ervebo shots in Bunia as Bundibugyo Ebola deaths reach 3,639

Congo began vaccinating front-line health workers in Bunia on 19 September against an Ebola outbreak that the government now counts at 7,541 confirmed cases and 3,639 deaths. A further 1,823 people have recovered. The campaign is aimed at the Bunia and Mongbwalu health zones in Ituri province, the centre of the current wave, and is designed to cover about 20,000 front-line staff in Ituri and North Kivu over six to nine months.

The vaccine on offer is Ervebo, Merck’s product licensed for Zaire ebolavirus, not for Bundibugyo ebolavirus, the species driving this outbreak. There is no licensed vaccine or treatment for Bundibugyo. Officials are using Ervebo anyway, on compassionate and study protocols, because early nonclinical data suggest some cross-protection and because waiting for a species-specific licence would leave the people closest to the patients unvaccinated.

Saturday’s launch in Bunia is also the start of BRAVO, a study run by Médecins Sans Frontières and its epidemiology arm Epicentre with the health ministry, Africa CDC, the National Institute for Biomedical Research and other partners. BRAVO will follow those 20,000 workers for at least six months after a three-month vaccination window. The question is practical: does Ervebo cut severe disease and death when the virus is Bundibugyo?

Ituri’s military governor, Maj. Gen. Gaby Kasongo Mulumba, said the choice of front-line staff was not arbitrary. They are the people who draw blood, move bodies and keep isolation wards open in a province that already lives with armed groups and displacement. Health workers have been a consistent share of cases in previous Congolese outbreaks. Protecting them is how a response keeps having a response.

The dose arithmetic is tight. The International Coordinating Group approved about 70,000 Ervebo doses for Congo: 50,000 for high-risk workers and 20,000 for a Phase 3 trial of Bundibugyo protection. Africa CDC said 16,520 doses had arrived by mid-September. By 17 September, 3,771 people had already been vaccinated under an earlier protocol that began on 27 August in Tshopo and Bas-Uele: 3,063 in Tshopo, 708 in Bas-Uele. Bunia is the move into the epicentre.

WHO has said the outbreak is still not under control and has been on a path that could pass the 2014-16 West Africa epidemic, which killed more than 11,000 people. This wave is already described inside Congo as the deadliest of the country’s 17 recorded Ebola outbreaks and the fastest-growing on record. Those labels depend on case definitions and testing access. The raw counts are high enough without the labels. Nearly half of confirmed patients have died.

The operational setting is the other half of the problem. Insecurity in Ituri and North Kivu limits how far vaccination teams can travel. Population movement moves the virus with the people. A health-worker strike earlier in the outbreak cut the number of hands available to ring-fence contacts. BRAVO and the Bunia campaign cannot fix those three facts. They can put a licensed-for-another-species shot into the arms of the staff who still show up.

Dr Manangama of MSF put the scientific caution in public. Even partial protection would matter. It still has to be shown. That sentence is why BRAVO exists instead of a silent compassionate rollout with no follow-up. If Ervebo does nothing against Bundibugyo, the next shipment should not be planned as if it does. If it does something, the 50,000-dose worker allocation becomes a tool rather than a hope.

Bunia’s WHO training centre is a concrete room and a cold chain. The study will live or die on whether those 20,000 people can be found again in six months in two provinces at war. Loss to follow-up is how outbreak trials fail even when the biology is kind. The partners know that. They launched anyway because the alternative is to keep counting 3,639 without a shot that has any chance of moving the number.

Saturday did not end the outbreak. It moved the vaccine from Tshopo and Bas-Uele into Ituri, put a study protocol on top of a compassionate protocol, and set a target of 20,000 arms. The next figures that matter are new confirmed cases in Bunia and Mongbwalu, vaccine coverage among staff who treat those cases, and, months from now, whether vaccinated workers appear less often on the death list than unvaccinated ones.