DEMOCRATIC REPUBLIC OF THE CONGO / RankWire.AI / – By August 3, the outbreak of Ebola in Congo had reached 3,874 confirmed cases and 1,751 fatalities, marking the country’s most extensive recorded epidemic. It ranks second worldwide only behind the 2014 to 2016 West Africa outbreak. Congo surpassed 1,000 confirmed cases within 40 days of initiating its response efforts, a pace significantly faster than its 2018 outbreak, which took approximately 235 days to reach the same milestone. This swift escalation is attributed to delayed detection, insufficient surveillance, ongoing conflict, population movement, and the lack of approved strain-specific medical interventions.
Congo’s Ministry of Public Health announced the outbreak on May 15 after laboratory testing identified Bundibugyo virus in Ituri province. The WHO was first alerted on May 5, following reports of a severe, unexplained illness near Mongbwalu. Subsequent investigations revealed the virus had been circulating for months before authorities recognized the outbreak. Initial testing in Bunia failed to detect Bundibugyo, as early symptoms mimicked malaria and other common febrile diseases. This delay allowed infected individuals and contacts to move through communities before containment measures, such as isolation and contact tracing, could be effectively implemented.
The identification of a different virus strain also impacted response strategies. Vaccines and antibody therapies proven effective against Zaire ebolavirus, responsible for Congo’s 2018 to 2020 epidemic, are not licensed for Bundibugyo virus disease. Consequently, patient care relies on early diagnosis, isolation, supportive treatment, infection control, contact tracing, and safe burial practices. The WHO has added a Bundibugyo diagnostic test to its emergency list and initiated treatment trials; however, these actions came too late to prevent widespread transmission.
Delayed detection hampers contact tracing efforts
The epidemic has expanded from Mongbwalu to encompass 49 health zones across Ituri, North Kivu, South Kivu, Haut-Uele, and Tshopo. Most cases and fatalities are concentrated in Ituri, particularly in Bunia, Rwampara, and Mongbwalu. WHO tracked 17,863 contacts as of July 30, yet only about three quarters received active follow-up in several affected provinces. Officials report that many new infections occur outside known contact chains, with surveillance teams often identifying cases only after additional exposures have already taken place.
Ongoing conflict and population displacement further complicate surveillance efforts. Armed attacks restrict access, disrupt response activities, and force some health teams to halt operations. Movement along mining routes, trade corridors, crowded displacement sites, and cross-border travel maintains high population mobility in affected regions. Additionally, healthcare facilities face shortages of protective gear, laboratory resources, transportation, and trained personnel. As of July 30, Congo recorded 151 infections and 44 deaths among healthcare workers. Front-line workers have also ceased operations in some areas due to delayed or inadequate compensation.
Conflict and treatment gaps challenge containment measures
Transmission occurs through direct contact with blood or bodily fluids of infected individuals or those who have died from the disease. It does not spread via casual proximity like influenza. Increased transmission risk arises in clinics lacking proper infection control and during burial rituals involving contact with infected bodies. More than 60% of recent deaths happened outside treatment centers, complicating safe burial practices and contact investigations. To address this, Congo’s health authorities, WHO, and Africa CDC have expanded laboratory capacities, treatment facilities, community outreach programs, and border surveillance efforts. Nonetheless, the response efforts still lag behind the scale and speed of new infections.
Uganda declared its linked Ebola outbreak over on July 28, after 42 days without new local cases. The single case treated in France resulted in no secondary transmissions, and the patient recovered. However, Congo remains the epicenter of ongoing transmission, with an early August confirmed case fatality rate of about 45%. The outbreak’s rapid spread is driven by late detection, incomplete contact tracing, and security challenges restricting access. The absence of approved vaccines and treatments for Bundibugyo virus further hampers containment, unlike the tools used to control earlier Zaire Ebola epidemics. These combined factors explain the unusually fast growth in case numbers.