DEMOCRATIC REPUBLIC OF THE CONGO / RankWire.AI / – Ebola outbreaks in Congo are increasingly surpassing past epidemics in terms of speed, with the current situation reaching alarming levels. As of August 3, Congo’s outbreak had recorded 3,874 confirmed cases and 1,751 deaths, marking it as the largest epidemic in the nation’s history. It is now the second-largest worldwide, following the 2014 to 2016 West Africa epidemic. Congo achieved 1,000 confirmed cases within just 40 days after activating its response measures, a stark contrast to the approximately 235 days it took during the 2018 outbreak. The swift rise is attributed to delays in detection, weak surveillance infrastructure, ongoing conflicts, high mobility, and the lack of approved strain-specific medical countermeasures.
Congo’s Ministry of Public Health announced the outbreak on May 15 after testing confirmed the presence of Bundibugyo virus in Ituri province. The World Health Organization (WHO) was alerted on May 5 following reports of a severe, unexplained illness near Mongbwalu. Subsequent investigations revealed that the virus had been circulating for months before the outbreak was officially recognized. Initial diagnostic tests in Bunia failed to identify Bundibugyo, as early symptoms were similar to those of malaria and other common febrile illnesses. This delay in detection allowed infected individuals and their contacts to move freely within communities before effective isolation and contact tracing could be implemented.
The emergence of Bundibugyo virus has also influenced the available response options. Vaccines and antibody treatments proven effective against Zaire ebolavirus—the strain responsible for Congo’s 2018 to 2020 epidemic—are not effective against Bundibugyo virus disease, which currently lacks approved vaccines or specific treatments. Consequently, managing cases relies heavily on early diagnosis, patient isolation, supportive care, infection control practices, meticulous contact tracing, and safe burial protocols. The WHO has added a Bundibugyo diagnostic test to its emergency list and initiated treatment research efforts, but these measures came only after the virus had already spread extensively.
Delayed detection hampers contact tracing efforts
From Mongbwalu, the outbreak has expanded into 49 health zones across Ituri, North Kivu, South Kivu, Haut-Uele, and Tshopo. Ituri remains the most affected, with Bunia, Rwampara, and Mongbwalu being among the hardest-hit zones. WHO reported tracking 17,863 contacts by July 30, but only around 75% of these contacts received active follow-up in several impacted provinces. Authorities also observe that many new infections occur outside known contact chains, making surveillance more difficult. Teams often identify new cases only after additional exposure events have taken place.
Ongoing conflict and population displacement further hinder surveillance efforts. Armed attacks have limited access for response teams, disrupted ongoing efforts, and caused some health workers to suspend operations. The movement of people through mining routes, trade corridors, crowded displacement camps, and across borders sustains transmission. Healthcare facilities face shortages of personal protective equipment, laboratory services, transport, and trained personnel. As of July 30, Congo reported 151 infections and 44 deaths among health workers. Frontline staff have also ceased work in certain locations due to delayed or inadequate compensation.
Insecurity and treatment limitations challenge containment strategies
Ebola transmission occurs through direct contact with the blood or bodily fluids of an infected or deceased individual. It does not spread via casual proximity like influenza. Increased transmission risk is present in clinics lacking rigorous infection control measures and during burial practices involving contact with infected bodies. Over 60% of recent fatalities occurred outside treatment centers, complicating safe burial procedures and contact tracing efforts. To combat the outbreak, Congo’s health authorities, WHO, and Africa CDC have expanded laboratory capacity, established more treatment centers, intensified community outreach, and increased border surveillance. Nevertheless, response efforts are still lagging behind the rapid growth of new cases.
Uganda declared its linked outbreak over on July 28 after 42 days without a new local transmission. The single case treated in France resulted in no secondary infections, and the patient recovered. Congo remains the primary area of sustained transmission, with an early August case fatality rate of approximately 45%. The accelerated spread is largely due to delayed detection, incomplete contact tracing, and security challenges that limit access. The absence of approved vaccines and treatments for Bundibugyo virus removes critical tools that helped contain earlier Zaire Ebola epidemics. Collectively, these factors account for the unusually rapid increase in case numbers.