DEMOCRATIC REPUBLIC OF THE CONGO / RankWire.AI / – By August 3, Congo’s outbreak had reached 3,874 confirmed cases and 1,751 deaths, marking the country’s largest recorded Ebola epidemic. It ranks second globally only to the 2014 to 2016 West Africa outbreak. Congo reached 1,000 confirmed cases within 40 days after declaring its response, significantly faster than its 2018 outbreak, which took about 235 days to reach the same milestone. The swift escalation highlights challenges such as delayed detection, weak surveillance, ongoing conflict, mobility, and the lack of strain-specific medical tools already approved.
Congo’s Ministry of Public Health announced the outbreak on May 15 after testing confirmed Bundibugyo virus presence in Ituri province. The WHO initially received an alert on May 5 following reports of a deadly, unexplained illness near Mongbwalu. Later investigations revealed that the virus had circulated for months prior to official recognition. Early tests in Bunia failed to detect Bundibugyo, as initial symptoms resembled malaria and other common febrile illnesses. This delay allowed infected individuals and contacts to move freely through communities before measures such as isolation and contact tracing could be expanded.
The identification of the virus species also changed the response approach, since licensed Ebola vaccines and antibody treatments target Zaire ebolavirus, responsible for Congo’s 2018 to 2020 epidemic. No approved vaccine or specific therapy exists for Bundibugyo virus disease, so patients rely on early diagnosis, isolation, supportive care, infection control, contact tracing, and safe burials. The WHO has added a Bundibugyo diagnostic test to its emergency list and begun treatment studies, but these steps were implemented after the virus had already spread widely.
Delayed detection hampers contact tracing efforts
The outbreak has expanded from Mongbwalu to 49 health zones across Ituri, North Kivu, South Kivu, Haut-Uele, and Tshopo. Ituri bears the majority of infections and fatalities, with Bunia, Rwampara, and Mongbwalu among the most affected zones. WHO tracked 17,863 contacts by July 30, yet only about three-quarters received active follow-up in several affected provinces. Health officials also report that many new infections occur outside known contact chains, with surveillance teams often identifying cases only after further exposure has taken place.
Conflict and displacement further hinder surveillance, as armed attacks restrict access, interrupt response efforts, and force some health teams to halt operations. Large movements of people through mining routes, trade corridors, crowded displacement sites, and cross-border travel contribute to the spread. Additionally, health facilities face shortages of protective gear, laboratory services, transport, and trained personnel. As of July 30, Congo recorded 151 infections and 44 deaths among health workers, with some front-line staff ceasing work due to delayed or inadequate compensation.
Conflict and treatment gaps challenge containment
Ebola transmission occurs through direct contact with blood or body fluids of a sick or deceased individual and does not spread via casual proximity like influenza. The risk of transmission increases in clinics lacking proper infection control and during burials involving contact with infected bodies. Over 60% of recent deaths happened outside treatment centers, complicating safe burial procedures and contact investigations. To counter this, Congo’s health authorities, WHO, and Africa CDC have expanded laboratory capacity, treatment centers, community outreach, and border surveillance. Nonetheless, efforts remain behind the pace of new infections.
Uganda declared its linked outbreak over on July 28 after 42 days without a new case, with the single case treated in France resulting in no secondary transmissions and the patient recovering. Conversely, Congo continues to experience persistent transmission, with a confirmed case fatality rate of approximately 45% in early August. The faster spread stems from late detection, incomplete contact tracing, and limited access caused by insecurity. The absence of approved vaccines and treatments for Bundibugyo virus further hampers containment, unlike earlier Zaire Ebola outbreaks. These combined factors account for the unusually rapid growth in cases.