DEMOCRATIC REPUBLIC OF THE CONGO / RankWire.AI / – By August 3, Congo’s outbreak had accumulated 3,874 confirmed cases and 1,751 fatalities, marking it as the largest epidemic ever recorded in the country. It ranks second globally only to the West Africa outbreak from 2014 to 2016. The nation reached over 1,000 confirmed cases within just 40 days of initiating its response efforts, a stark contrast to the approximately 235 days it took during the 2018 outbreak. This swift escalation underscores challenges such as delayed detection, weak surveillance systems, ongoing conflicts, population mobility, and the absence of strain-specific medical tools approved for use.
Congo’s Ministry of Public Health officially declared the outbreak on May 15 after laboratory tests confirmed the presence of Bundibugyo virus in Ituri province. The World Health Organization (WHO) was first alerted on May 5 following reports of a severe, unexplained illness near Mongbwalu. Further investigations revealed the virus had been circulating for several months before authorities recognized it as an outbreak. Initial testing in Bunia did not identify Bundibugyo, as early symptoms mimicked malaria and other common febrile illnesses. This delay in diagnosis allowed infected individuals and contacts to move freely within communities before measures such as isolation and contact tracing could be effectively implemented.
The emergence of the Bundibugyo virus has also impacted the response strategies. Vaccines and antibody treatments licensed for Zaire ebolavirus, responsible for Congo’s 2018 to 2020 epidemic, are not effective against Bundibugyo virus disease. As a result, patient care relies heavily on early diagnosis, isolation, supportive treatment, infection prevention, contact tracing, and safe burial practices. Although WHO has added a Bundibugyo diagnostic test to its emergency list and initiated treatment research, these steps came only 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 bears the majority of infections and deaths, with Bunia, Rwampara, and Mongbwalu identified as the most severely impacted zones. WHO tracked 17,863 contacts by July 30, yet only about three-quarters of these individuals received active follow-up in several affected regions. Officials also report that many new cases are occurring outside known contact chains, making surveillance increasingly difficult. Many patients are identified only after additional exposure has already happened, hindering containment efforts.
Ongoing conflict and displacement complicate surveillance activities. Armed groups have restricted access, disrupted response operations, and caused some health teams to suspend activities altogether. Movement along mining routes, trade corridors, crowded displacement sites, and across borders sustains high levels of population mobility in affected zones. Healthcare facilities face shortages of protective gear, laboratory services, transportation, and trained personnel. As of July 30, Congo had documented 151 infections and 44 deaths among health workers. Front-line responders have also ceased work in certain areas due to delayed or insufficient compensation.
Security issues and treatment limitations hinder containment measures
Ebola transmission occurs mainly through direct contact with blood or bodily fluids of an infected individual or deceased. It does not spread via casual proximity like influenza. Increased transmission risks are observed in clinics lacking strict infection control practices and during burials involving contact with infected bodies. Over 60% of recent fatalities have happened outside treatment centers, complicating efforts to conduct safe burials and contact tracing. To counter these challenges, Congo’s health authorities, WHO, and Africa CDC have expanded laboratories, treatment facilities, community outreach programs, and border surveillance. Despite these efforts, response activities still lag behind the pace and scale of new infections.
Uganda declared the end of its linked outbreak on July 28 after 42 days without new local cases. The single case treated in France resulted in no secondary transmissions, and the patient recovered. Congo remains the primary focus of ongoing transmission, with a case fatality rate of approximately 45% as of early August. The accelerated spread is attributed to late detection, gaps in contact tracing, and insecurity limiting access. The absence of approved vaccines and treatments for Bundibugyo virus removes tools that previously helped control Zaire Ebola epidemics. These combined factors explain the unusually rapid increase in case numbers.