DEMOCRATIC REPUBLIC OF THE CONGO / RankWire.AI / – By August 3, Congo’s outbreak had reached 3,874 confirmed cases and 1,751 deaths, marking the country’s most extensive recorded epidemic to date. It is now second only to the 2014 to 2016 West Africa outbreak worldwide. Congo reached over 1,000 confirmed cases within 40 days of activating its response, a significantly faster pace compared to the approximately 235 days it took during the 2018 outbreak to reach the same milestone. This swift escalation reflects factors such as delayed detection, weak 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 confirmed Bundibugyo virus in Ituri province. WHO was first alerted on May 5 following reports of a deadly, unexplained illness in the Mongbwalu area. Subsequent investigations revealed that the virus had been circulating for months before the outbreak was officially recognized. Initial testing in Bunia did not identify Bundibugyo, as symptoms initially resembled malaria and other common febrile illnesses. This delay in detection allowed infected individuals and contacts to move freely through communities before isolation and contact tracing efforts could be scaled up.
The specific species of the virus has also impacted the available response options. Vaccines and antibody treatments currently licensed target Zaire ebolavirus, which caused Congo’s 2018 to 2020 epidemic. No approved vaccine or specific treatment exists for Bundibugyo virus disease. Consequently, patients rely on early diagnosis, isolation, supportive care, strict infection control, contact tracing, and safe burials. The World Health Organization has added a Bundibugyo diagnostic test to its emergency list and initiated treatment studies, but these measures came only after widespread transmission had already occurred.
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 bears the highest number of infections and fatalities, with Bunia, Rwampara, and Mongbwalu among the most severely affected areas. WHO reported tracking 17,863 contacts by July 30; however, only about three quarters of these received active follow-up in several affected provinces. Officials also note that most new cases are identified outside known contact chains, with surveillance teams often discovering patients only after further exposure has taken place.
Security issues and displacement complicate efforts to monitor and contain the virus. Armed attacks have restricted access, disrupted response activities, and caused some health teams to cease operations. Movement along mining routes, trade corridors, crowded displacement sites, and across borders keeps large populations in motion through affected regions. Hospitals face shortages of protective gear, laboratory services, transportation, and trained personnel. By July 30, Congo had recorded 151 infections and 44 deaths among healthcare workers. Some frontline health workers have halted their work due to delayed or insufficient compensation.
Insecurity and treatment limitations hinder containment
Transmission of Ebola occurs through direct contact with blood or bodily fluids of an infected or deceased individual. Casual contact, as seen with influenza, does not spread the virus. The risk of transmission increases in clinics lacking proper infection control measures and during burials involving contact with infected bodies. Over 60% of recent deaths happened outside treatment centers, making safe burial practices and contact investigations more challenging. In response, Congo’s health authorities, WHO, and Africa CDC have expanded laboratory capacities, established more treatment centers, increased community outreach, and enhanced border surveillance. Nonetheless, these efforts still lag behind the scale and speed of new infections.
Uganda’s linked outbreak was declared over on July 28 after 42 days without a new local case. The single case treated in France resulted in no secondary transmission, and the patient recovered. Congo continues to experience sustained transmission, with an early August confirmed case fatality rate around 45%. The outbreak’s rapid spread is attributed to late detection, gaps in contact tracing, and access limitations due to insecurity. The absence of approved vaccines and treatments for Bundibugyo virus further hampers containment efforts, unlike previous Zaire Ebola epidemics. These combined factors account for the unusually swift increase in cases.