DEMOCRATIC REPUBLIC OF THE CONGO / RankWire.AI / – Congo’s Ebola outbreak had reached 3,874 confirmed cases and 1,751 deaths by August 3, making it the country’s largest recorded epidemic. It ranks second worldwide only to the 2014 to 2016 West Africa outbreak. Congo crossed 1,000 confirmed cases within 40 days after activating its response. Its 2018 outbreak took about 235 days to pass the same mark. The swift increase highlights issues such as delayed detection, inadequate surveillance, ongoing conflict, high mobility, and the lack of approved strain-specific medical interventions.
Congo’s Ministry of Public Health announced the outbreak on May 15 after testing identified Bundibugyo virus in Ituri province. The WHO was first alerted on May 5, following reports of a severe, unexplained illness around Mongbwalu. Subsequent investigations revealed that the virus had been circulating for months before officials recognized the outbreak. Initial tests in Bunia did not detect Bundibugyo, as early symptoms resembled malaria and other common febrile illnesses. This delay allowed infected individuals and contacts to move freely within communities before effective isolation and contact tracing could be implemented.
The virus type also impacted the available response options. Licensed Ebola vaccines and proven antibody treatments target Zaire ebolavirus, which caused Congo’s 2018 to 2020 epidemic. There is no approved vaccine or specific treatment for Bundibugyo virus disease. Consequently, patient management relies on early diagnosis, isolation, supportive care, infection prevention measures, contact tracing, and safe burial practices. The WHO has added a Bundibugyo diagnostic test to its emergency list and initiated treatment research, but these efforts came after widespread transmission had already occurred.
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 accounts for the majority of cases and fatalities, with Bunia, Rwampara, and Mongbwalu among the most severely affected zones. WHO recorded 17,863 contacts by July 30, yet only roughly 75% of these received active follow-up in several affected regions. Officials also report that many new infections occur outside known contact chains. Surveillance teams are discovering numerous patients only after additional exposures have taken place.
Ongoing conflict and population displacement complicate surveillance efforts. Armed attacks have restricted access, disrupted response activities, and forced some health teams to cease operations. Cross-border movement, trade routes, crowded displacement camps, and mining corridors contribute to the continued spread of the virus. Moreover, health facilities face shortages of protective gear, laboratories, transportation, and trained personnel. As of July 30, Congo had documented 151 infections and 44 deaths among healthcare workers. Frontline staff have also ceased work in some locations due to delayed or insufficient compensation.
Security issues and treatment gaps challenge containment efforts
Ebola transmits through direct contact with the blood or body fluids of an infected individual or a deceased person. It does not spread through casual proximity like influenza. Transmission risk increases in clinics lacking robust infection control and during burials involving contact with contaminated bodies. Over 60% of recent deaths occurred outside treatment facilities, complicating safe burial procedures and contact investigations. To address this, Congo’s health authorities, WHO, and Africa CDC have expanded laboratory capacity, treatment centers, community outreach, and border surveillance. Nonetheless, the response still lags behind the scale and pace of new infections.
Uganda declared the end of its linked outbreak on July 28 after 42 days without new locally acquired cases. The single case treated in France resulted in no secondary transmissions, and the patient recovered. However, Congo continues to be the epicenter of ongoing transmission, with an early August confirmed case fatality rate of approximately 45%. The outbreak’s acceleration is attributed to delayed detection, incomplete contact tracing, and limited access due to insecurity. The absence of approved vaccines and treatments for Bundibugyo virus further hampers containment, unlike earlier Zaire Ebola outbreaks. These combined factors explain the unusually rapid increase in cases.