The Bundibugyo virus disease (BVD) outbreak in the Democratic Republic of the Congo and Uganda is a rapidly evolving crisis that demands urgent attention and action. As of June 6, 2026, the situation is dire, with a total of 534 confirmed cases and 93 deaths reported from both countries. This article delves into the complexities of this outbreak, exploring its causes, impact, and the ongoing public health response. It highlights the importance of coordinated efforts, enhanced cross-border collaboration, and sustained surveillance to prevent further regional spread and ensure an effective public health response.
A Zoonotic Threat
BVD is a severe and often fatal form of Ebola disease caused by the Bundibugyo virus, a member of the Orthoebolavirus species. It is a zoonotic disease, with fruit bats suspected to be the natural reservoir. Human infection occurs through close contact with the blood or secretions of infected wildlife, such as bats or non-human primates. This virus spreads from person to person through direct contact with the blood, secretions, organs, or other bodily fluids of infected individuals or contaminated surfaces or items. Transmission is particularly amplified in healthcare settings when infection prevention and control (IPC) measures are inadequate, and during unsafe burial practices involving direct contact with the deceased.
A Complex Epidemiology
The incubation period for BVD ranges from two to 21 days, and individuals are not infectious until symptom onset. Early symptoms such as fever, fatigue, muscle pain, headache, and sore throat are non-specific, complicating clinical diagnosis and delaying detection. These symptoms then progress to gastrointestinal symptoms, organ dysfunction, and in some cases, haemorrhagic manifestations. The case fatality rates in the past two BVD outbreaks, reported in Uganda and the Democratic Republic of the Congo in 2007 and 2012, were 30% and 50%, respectively.
A Growing Threat
The outbreak in the Democratic Republic of the Congo has been ongoing since May 29, 2026, with an additional 390 confirmed cases and 74 confirmed deaths reported since then. The outbreak remains concentrated in Ituri Province, which accounts for 94% of confirmed cases. The CFR in Ituri is 15%, significantly lower than the CFR in North Kivu, which is 64%. The highest confirmed case numbers in Ituri Province are reported from Bunia, Rwampara, Mongbwalu, and Nyankunde health zones.
In Uganda, since the last update dated May 29, 2026, an additional 10 confirmed cases and one death have been reported. As of June 6, 2026, a total of 19 confirmed cases, including two deaths in imported cases, and one probable case who has died, have been reported. Five recoveries have been reported. Of the total cases, 14 are imported, and five are Ugandans. The cases were reported from two districts, Kampala and Wakiso.
A Public Health Response
Health authorities in the Democratic Republic of the Congo and Uganda, in collaboration with WHO and partners, are implementing comprehensive public health measures. These include implementing the continental response plan, engaging donors, and mobilizing additional resources to address critical funding gaps and sustain response operations across affected and at-risk areas.
Key response activities also include interagency coordination and deployment of field teams, delivery of medical supplies, strengthening surveillance, increasing laboratory capacity, infection prevention and control, setting up safe and optimized treatment centers, risk communication, and community engagement. Research on potential medical countermeasures is also ongoing.
A Global Concern
The WHO has reassessed the risk of the outbreak, separating the risk for countries sharing land borders with the Democratic Republic of the Congo and Uganda from the risk for other countries in the African Region. The risk in the Democratic Republic of the Congo remains very high due to ongoing transmission and the continued expansion of the outbreak into new health zones. The risk in Uganda is high due to confirmed cross-border spread through imported cases and ongoing epidemiological links along the eastern Democratic Republic of the Congo-western Uganda corridor.
The WHO advises against any restriction of travel to or trade with the Democratic Republic of the Congo or Uganda based on the currently available information. The organization continues to closely monitor and verify travel and trade measures in relation to this event.
A Call for Action
The BVD outbreak in the Democratic Republic of the Congo and Uganda is a complex and urgent public health crisis. It requires coordinated efforts, enhanced cross-border collaboration, and sustained surveillance to prevent further regional spread and ensure an effective public health response. The world must act swiftly and decisively to contain this outbreak and protect vulnerable populations from the devastating impact of this deadly disease.
