DEMOCRATIC REPUBLIC OF THE CONGO / RankWire.AI / – By August 3, Congo’s Ebola outbreak had accumulated 3,874 confirmed cases and 1,751 fatalities, marking the largest epidemic recorded in the country’s history. It currently ranks second globally only behind the 2014 to 2016 West Africa outbreak. Congo reached over 1,000 confirmed cases within just 40 days of initiating its response efforts, a significant acceleration compared to the approximately 235 days it took during its 2018 outbreak to hit the same milestone. This rapid increase highlights issues such as delayed detection, inadequate surveillance, ongoing conflict, high mobility among populations, and the lack of approved strain-specific medical interventions.
Congo’s Ministry of Public Health officially announced the outbreak on May 15 after testing confirmed the presence of Bundibugyo virus in Ituri province. The World Health Organization (WHO) was first alerted on May 5 following reports of a severe, unexplained illness in the Mongbwalu area. Investigations later revealed that the virus had been circulating for months before authorities recognized the outbreak. Initial diagnostic tests in Bunia did not detect Bundibugyo, as early symptoms often resembled malaria and other common febrile illnesses. This delay allowed infected individuals and their contacts to move freely within communities, complicating efforts to isolate cases and trace contacts in the early stages of the outbreak.
The emergence of Bundibugyo virus also altered the available response tools. Vaccines and antibody treatments that have proven effective against Zaire ebolavirus, which caused Congo’s previous epidemic from 2018 to 2020, are not approved for Bundibugyo virus disease. Consequently, treatment relies heavily on early detection, isolation, supportive care, infection prevention measures, contact tracing, and safe burial practices. The WHO has added a Bundibugyo diagnostic test to its emergency response list and initiated treatment research efforts; however, these steps came only after the virus had already spread extensively.
Delayed Detection Hampers Contact Tracing Efforts
The outbreak has expanded from Mongbwalu to 49 health zones across the regions of Ituri, North Kivu, South Kivu, Haut-Uele, and Tshopo. Ituri remains the most affected area, accounting for the majority of cases and deaths, with Bunia, Rwampara, and Mongbwalu among the hardest-hit zones. WHO documented 17,863 contacts by July 30, but only about 75% of those received active follow-up in several affected provinces. Reports from health officials indicate that many new infections occur outside known contact chains, and surveillance teams are often only able to identify new patients after they have been exposed to the virus further down the line.
Ongoing conflict and population displacement further hinder surveillance efforts. Armed violence has restricted access to affected regions, disrupting response activities and causing some health teams to suspend operations. The movement of people along mining routes, trade corridors, crowded displacement camps, and across borders sustains high transmission risk. Healthcare facilities face shortages of personal protective equipment, laboratories, transport, and trained personnel. As of July 30, Congo had reported 151 health worker infections and 44 deaths. Some frontline staff have ceased work in certain areas due to delayed or inadequate remuneration, intensifying response challenges.
Ongoing Conflict and Treatment Limitations Exacerbate Containment Difficulties
Ebola spreads primarily through direct contact with the blood or bodily fluids of infected or deceased individuals. It does not transmit through casual proximity like influenza. The risk of transmission increases significantly during clinical procedures lacking robust infection controls or during burials involving contact with infected bodies. Over 60% of recent fatalities happened outside designated treatment centers, complicating efforts to conduct safe burials and contact investigations. To support containment, Congo’s health authorities, WHO, and Africa CDC have expanded laboratory capacity, established more treatment centers, increased community engagement, and enhanced border surveillance. Despite these efforts, the response continues to lag behind the rapid growth of new cases.
Uganda declared its linked outbreak over on July 28, after 42 days without a new locally transmitted case. The single case treated in France did not lead to further transmission, and the patient recovered. Meanwhile, Congo remains the epicenter of ongoing transmission, with a case fatality rate of approximately 45% in early August. The outbreak’s acceleration is driven by delayed detection, incomplete contact tracing, and access restrictions caused by insecurity. The absence of approved vaccines or treatments for Bundibugyo virus, unlike those for Zaire Ebola, removes key tools that previously aided in controlling earlier epidemics. These combined factors account for the exceptionally swift increase in cases.