Congo’s Bundibugyo Ebola Outbreak Sets Strain Record
The Ebola outbreak caused by Bundibugyo virus in the Democratic Republic of the Congo has become the largest recorded outbreak of that strain, according to a World Health Organization weekly report using data through July 26, 2026.
The outbreak remains concentrated in eastern Congo’s Ituri Province but has expanded across multiple health zones and five provinces. WHO says sustained transmission, population movement, displacement, insecurity and limited access to health services are making it harder to find cases, trace contacts and interrupt spread.
The distinction matters: “largest Bundibugyo outbreak” refers to the virus strain, not the largest Ebola outbreak of any type.
Many infections are outside known contact networks
Associated Press reported from Bunia on August 4 that the latest government update listed 3,802 cases and 1,707 deaths as of Tuesday. Those figures are not directly interchangeable with WHO’s earlier cumulative count because they come from a different reporting date and may use different case classifications.
WHO’s Disease Outbreak News update dated July 17 reported 2,124 confirmed cases and 828 deaths in Congo as of July 15. WHO cautioned that newly reported cases and deaths can include backlogs of samples and therefore do not necessarily represent infections acquired during the same period.
AP also reported that nearly 80% of cases were not coming from contact tracing but instead were being identified through community spread, citing Africa CDC Director-General Jean Kaseya. That wording describes how cases are being detected, not a claim that 80% of infections began outside known networks. It nevertheless points to a major surveillance problem: response teams are finding many patients who were not already linked to known contacts.
WHO’s July 17 bulletin said Congo’s cases had been reported from 46 health zones across Ituri, North Kivu, South Kivu, Haut-Uele and Tshopo provinces. Thirty-eight of those zones had reported cases within the previous 21 days. Ituri accounted for 89.6% of confirmed cases at that reporting point.
Conflict and displacement raise containment risks
The outbreak is unfolding in communities affected by armed conflict, displacement and limited access to food, water, shelter, health care and protection. Overcrowded sites for internally displaced people and frequent movement can delay testing, treatment and contact follow-up.
WHO said security incidents affecting health facilities have restricted access for response teams, disrupted surveillance and increased the risk of undetected transmission. Community deaths, mistrust and delayed care can also make it harder to conduct safe burials and identify people who may have been exposed.
Health workers face particular risks. WHO reported 119 confirmed infections among health workers in its July 17 update, including 36 deaths. The figures underscore why infection prevention and control in health facilities is central to the response: hospitals and clinics can amplify transmission when staff lack adequate training, protective equipment or safe procedures.
Response focuses on facilities, surveillance and communities
WHO and Congo’s health authorities are expanding surveillance, laboratory testing, treatment capacity, infection-prevention work and community engagement. A WHO Africa update published July 30 said infection-prevention measures had been expanded across more than 900 health facilities, with training provided to more than 1,000 health workers.
The response also includes cross-border preparedness and coordination with Uganda. Uganda began a 42-day period of enhanced surveillance on July 16, after its last confirmed patient was discharged following two negative tests. WHO says the period is required before the outbreak can be declared over, provided no new confirmed cases are detected.
Uganda has reported 20 confirmed cases and two deaths in the linked outbreak. Fifteen cases were imported from Congo and five were locally acquired, according to WHO Africa. Because transmission continues in Congo, a new imported case could reset Uganda’s countdown to day zero.
There is no approved vaccine or specific treatment for Bundibugyo virus disease. Clinical trials of investigational post-exposure drugs are under way in Ituri, while separate vaccine studies are being conducted in the United Kingdom and Canada. The studies have not established an approved vaccine or treatment.
WHO says global risk remains low
WHO assesses the risk as very high within Congo, high in Uganda and in countries sharing land borders with areas where Bundibugyo virus has been detected, and low for the rest of Africa and the world.
WHO is not recommending travel or trade restrictions against Congo or Uganda based on the information currently available. For people outside the affected region, the main significance is the need for sustained support, cross-border surveillance and reliable outbreak information—not a new global travel emergency.
Sources
- WHO Disease Outbreak News, July 17, 2026
- WHO Africa weekly outbreak report, data through July 26, 2026
- Associated Press report from Bunia, August 4, 2026
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