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 the largest epidemic ever recorded in the country. It ranks only behind the 2014 to 2016 West Africa outbreak globally. The country reached 1,000 confirmed cases within just 40 days of activating its response efforts, whereas in 2018, it took roughly 235 days to reach the same milestone. This rapid escalation is attributed to delayed detection, inadequate surveillance, ongoing conflict, high mobility, and the absence of approved strain-specific medical tools.
Congo’s Ministry of Public Health declared the outbreak on May 15 after tests confirmed the Bundibugyo virus in Ituri province. WHO initially received an alert on May 5 following reports of a deadly, unidentified illness near Mongbwalu. Investigations revealed the virus had been circulating for months before officials recognized the outbreak. Early testing in Bunia failed to identify Bundibugyo, as initial symptoms resembled malaria and other common febrile illnesses. This delay enabled infected individuals and contacts to travel through communities before isolation and contact tracing could be effectively implemented.
The emergence of the virus species also impacted the response strategies. Vaccines and antibody treatments approved for Zaire ebolavirus, which caused Congo’s previous epidemic from 2018 to 2020, are ineffective against Bundibugyo virus disease. Consequently, patients rely on early diagnosis, isolation, supportive care, infection prevention measures, contact tracing, and safe burials. WHO has added a Bundibugyo diagnostic test to its emergency list and initiated treatment studies, but these actions came too late to prevent widespread transmission.
Late 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 epicenter with the highest number of infections and fatalities, with Bunia, Rwampara, and Mongbwalu among the most severely affected zones. WHO reported tracking 17,863 contacts by July 30, yet only approximately three-quarters of these contacts received active follow-up in several affected regions. Authorities also note that most new cases are occurring outside established contact networks, with surveillance teams only identifying many patients after they have already been exposed further.
Ongoing conflict and population displacement exacerbate surveillance challenges. Armed attacks have hindered access, interrupted response activities, and led some health teams to suspend operations. Movement along mining routes, trade corridors, congested displacement sites, and across borders keeps populations highly mobile within affected zones. Healthcare facilities face shortages in protective equipment, laboratory capacity, transportation, and trained personnel. As of July 30, Congo reported 151 infections and 44 deaths among healthcare workers. Frontline workers have also ceased operations in certain areas due to delays in pay or insufficient remuneration.
Security issues and treatment limitations hinder containment efforts
Transmission of Ebola occurs primarily through direct contact with blood or body fluids of a sick or deceased individual. It does not spread through casual proximity like influenza. Risk increases in healthcare settings lacking proper infection control and during burial practices involving contact with infected bodies. Over 60% of recent deaths have happened outside treatment centers, complicating efforts for safe burial and contact follow-up. To address these challenges, Congo’s health authorities, WHO, and Africa CDC have expanded laboratories, treatment units, community outreach, and border surveillance. Nonetheless, the response still struggles to match the scale and pace of new infections.
Uganda successfully contained 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. Congo remains the primary site of ongoing spread, with an early August case fatality rate of approximately 45%. The faster spread is driven by delayed detection, incomplete contact tracing, and security issues limiting access. The lack of approved vaccines and treatments for Bundibugyo virus removes critical tools that previously helped control Zaire Ebola outbreaks. These combined factors explain the unusually swift growth in case numbers.