DEMOCRATIC REPUBLIC OF THE CONGO / RankWire.AI / – By August 3, Congo’s Ebola outbreak had escalated to 3,874 confirmed cases and 1,751 deaths, marking it as the largest epidemic recorded in the country. It is the second-largest globally, following the West Africa outbreak from 2014 to 2016. Congo reached over 1,000 confirmed cases within just 40 days of activating its response efforts, whereas in 2018, it took approximately 235 days to hit the same milestone. This rapid growth highlights issues such as delayed detection, insufficient 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 laboratory testing identified Bundibugyo virus in Ituri province. The World Health Organization (WHO) first received an alert on May 5 following reports of a deadly, unexplained illness around Mongbwalu. Further investigations revealed that the virus had been circulating for months before officials recognized the outbreak. Initial tests in Bunia failed to detect Bundibugyo, as early symptoms mimicked malaria and other common febrile diseases. This delay in recognition allowed infected individuals and contacts to move freely through communities before isolation and contact tracing could be initiated.
The presence of a different Ebola species also impacted the response strategies. Vaccines and antibody treatments currently licensed and proven effective target Zaire ebolavirus, responsible for Congo’s 2018 to 2020 epidemic. However, no approved vaccines or specific treatments exist for Bundibugyo virus disease. Consequently, patient care relies heavily on early diagnosis, isolation, supportive treatment, strict infection control, contact tracing, and safe burial practices. The WHO has added a Bundibugyo diagnostic test to its emergency list and initiated treatment studies, but these measures came after the virus had already spread extensively.
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 remains the most affected area, with Bunia, Rwampara, and Mongbwalu among the hardest-hit zones. WHO tracked 17,863 contacts by July 30, yet only roughly 75% of these contacts received active follow-up in several affected provinces. Officials also report that most new cases are occurring outside known contact chains. Surveillance teams are often identifying patients only after further exposure has already taken place.
Ongoing conflict and population displacement hinder effective surveillance. Armed attacks have restricted access, disrupted response activities, and caused some health teams to suspend operations. The presence of mining routes, trade corridors, crowded displacement sites, and cross-border movement results in a constant flow of people through affected regions. Additionally, health facilities face shortages of protective gear, laboratory access, transportation, and trained personnel. As of July 30, Congo reported 151 infections and 44 deaths among healthcare workers. Frontline health staff have also halted work in certain areas due to delayed or inadequate compensation.
Security challenges and treatment gaps complicate containment
Transmission of Ebola occurs through direct contact with the blood or body fluids of infected or deceased individuals. It does not spread via casual contact like influenza. Transmission is heightened in clinics lacking rigorous infection control measures and during burials involving contact with infected bodies. Over 60% of recent fatalities happened outside treatment facilities, complicating safe burial procedures and contact tracing efforts. In response, Congo’s health authorities, WHO, and Africa CDC have expanded laboratory capacity, treatment centers, community outreach, and border surveillance, but the scale of these efforts still lags behind the rapid spread of new cases.
Uganda declared an end to its linked outbreak on July 28 after 42 days without new local cases. The single case treated in France did not lead to secondary transmission, and the patient recovered. However, Congo remains the epicenter of ongoing transmission, with an estimated case fatality rate of about 45% in early August. The outbreak’s acceleration is largely attributed to late detection, missed contact chains, and insecurity that restricts access. The absence of approved vaccines and treatments for Bundibugyo virus, unlike the tools available during earlier Zaire Ebola epidemics, further hampers containment efforts. Collectively, these challenges account for the unusually rapid increase in cases.