Congo Launches Critical Ebola Vaccine Trial to Protect Healthcare Workers
Kinshasa, 22 September 2026
Health workers in the Democratic Republic of Congo have begun trialling an Ebola vaccine designed for a different strain, hoping to secure vital cross-protection against the current deadly outbreak.
A High-Stakes Trial in the Epicentre
On Saturday, 19 September 2026, a critical clinical trial commenced in Bunia, the capital of the northeastern Ituri province, to evaluate the efficacy of the Ervebo vaccine against the Bundibugyo strain of the Ebola virus [3][4]. Developed by Merck and approved in late 2019, Ervebo is highly effective at protecting against the more common Ebola-Zaire strain, boasting an 84 per cent efficacy rate within 10 days of administration [3]. However, its effectiveness against the Bundibugyo strain remains scientifically unproven, though limited historical data suggests it may offer some cross-protection [2][3]. The trial targets 50,000 frontline healthcare workers who face extreme risk, with 20,000 individuals enrolled in a one-year monitoring phase to assess real-world efficacy [4]. This compassionate-use programme utilizes a portion of the 70,000 vaccine doses approved by the World Health Organization (WHO) and delivered to Congolese authorities [2][4].
Rising Transmission and Systemic Strain
The current outbreak, which officially began on 15 May 2026, has grown into the largest in the history of the Democratic Republic of Congo (DRC) and the second largest recorded globally [3]. As of 19 September 2026, the epidemic has resulted in 7,541 confirmed infections, 3,639 deaths, and 1,823 recoveries [4]. This places the overall case-fatality rate at approximately 48.256 per cent [4]. On 18 September 2026, Médecins Sans Frontières (MSF) challenged optimistic statements from WHO officials regarding a slowdown, warning that there is no clear evidence the epidemic is coming under control [4]. This warning was reinforced on 21 September 2026, when MSF reported that the virus had spread to South Ubangi, making it the seventh affected province [1]. Furthermore, North Kivu now accounts for nearly 50 per cent of all new confirmed cases, with test positivity rates rising sharply [1].
Conflict, Border Safety, and Refugee Concerns
Managing the health crisis is severely complicated by ongoing geopolitical instability and conflict in the eastern DRC. In January 2025, the M23 militia seized control of Goma in North Kivu and Bukavu in South Kivu, precipitating a major humanitarian emergency that has crippled local health infrastructure and restricted access for outbreak response teams [2]. For Congolese refugees living in the Kakuma and Kalobeyei camps in neighbouring Turkana, Kenya, these compounding crises are a source of deep anxiety [GPT]. These displaced populations closely monitor the deteriorating security and health situations in their home country, where active conflict and porous borders raise significant safety concerns and hinder potential repatriation efforts [GPT]. Local health systems in active zones like Bambu are already stretched past their limits by chronic funding gaps, staffing shortages, and weak referral capacities, leaving rapid-response teams to bridge critical gaps [1].
The Disproportionate Impact on Young Children
A particularly devastating aspect of the Bundibugyo strain outbreak is its disproportionate impact on young children. According to data reported by the WHO, children comprise nearly 25 per cent of confirmed Ebola cases but account for almost 33 per cent of the total death toll [2]. The vulnerability of the youngest patients is stark: children under the age of five face a fatality rate exceeding 60 per cent, which is more than double the adult fatality rate of under 30 per cent [2]. Paediatric care in Ebola isolation zones presents immense clinical and emotional challenges, as young children require specialized paediatric-sized equipment, medication, and highly trained staff [2]. To alleviate the emotional strain of isolation, humanitarian organisations like ALIMA have redesigned treatment centres in Ituri to facilitate family visits and increase direct contact between staff and young patients [2].