DEMOCRATIC REPUBLIC OF THE CONGO / RankWire.AI / – By August 3, Congo’s Ebola outbreak had reached a total of 3,874 confirmed cases and 1,751 deaths, making it the largest epidemic recorded in the country to date. It is the second-largest Ebola outbreak worldwide, surpassed only by the West Africa epidemic from 2014 to 2016. Congo reached over 1,000 confirmed cases within just 40 days of activating its response efforts, whereas the 2018 outbreak took approximately 235 days to reach that milestone. This rapid escalation highlights issues such as delayed detection, fragile surveillance systems, ongoing conflict, high mobility, and the absence of approved strain-specific medical interventions.
Congo’s Ministry of Public Health officially declared the outbreak on May 15 after laboratory testing identified the Bundibugyo virus in Ituri province. The World Health Organization first received an alert on May 5, following reports of a severe, unexplained illness circulating around Mongbwalu. Further investigations revealed that the virus had been spreading for months before authorities recognized the outbreak. Initial diagnostic tests in Bunia failed to identify Bundibugyo, as early symptoms closely resembled malaria and other common febrile diseases. This delay allowed infected individuals and their contacts to move freely within communities before isolation and contact tracing efforts could be expanded.
The switch in virus species also affected available response strategies. Vaccines and antibody treatments that are licensed and proven effective against Zaire ebolavirus—responsible for Congo’s previous 2018 to 2020 epidemic—do not exist for Bundibugyo virus disease. Consequently, patient management relies on early detection, isolation, supportive care, infection prevention, contact tracing, and safe burial practices. The World Health Organization has added a Bundibugyo diagnostic test to its emergency list and initiated treatment trials, but these measures arrived after the virus had already spread extensively.
Delayed detection hampered contact tracing efforts
The outbreak has expanded from Mongbwalu to encompass 49 health zones across Ituri, North Kivu, South Kivu, Haut-Uele, and Tshopo, with Ituri bearing the brunt of infections and fatalities, especially in Bunia, Rwampara, and Mongbwalu, which are among the most affected zones. WHO reported tracking 17,863 contacts by July 30, yet only about 75% of those contacts received active follow-up in several affected regions. Officials also note that most new infections are occurring outside known contact chains, with surveillance teams discovering many cases only after additional exposures have already taken place.
Conflict and displacement exacerbate the challenge of surveillance efforts. Armed attacks have restricted access, disrupted ongoing response activities, and led some health teams to suspend operations. The movement of people through mining routes, trade corridors, crowded displacement sites, and across borders continues to facilitate the spread of the virus. Health facilities face shortages of protective gear, laboratory access, transportation, and trained personnel. By July 30, Congo had documented 151 infections and 44 deaths among health workers. Frontline responders have also ceased work in certain locations due to delays or inadequacies in compensation.
Ongoing conflict and treatment deficiencies hinder containment efforts
Transmission of Ebola occurs primarily through direct contact with the blood or bodily fluids of infected or deceased persons, not via casual proximity like influenza. The risk of spread increases in clinics lacking strict infection control protocols and during burials involving contact with contaminated bodies. Over 60% of recent fatalities happened outside medical facilities, complicating efforts to ensure safe burials and conduct contact investigations. In response, Congo’s health authorities, WHO, and Africa CDC have scaled up laboratory testing, treatment centers, community outreach, and border surveillance; however, these efforts still lag behind the rapid pace and extent of new infections.
Uganda declared the end of its linked outbreak on July 28 after 42 days without a new locally transmitted case. The single case treated in France did not lead to secondary transmissions, and the patient recovered. Nevertheless, Congo remains the epicenter of ongoing transmission, with a case fatality rate of approximately 45% as of early August. The outbreak is accelerating due to late detection, incomplete contact tracing, and limited access caused by insecurity. The absence of approved vaccines and treatments for Bundibugyo virus further hampers containment, unlike the earlier outbreaks of Zaire ebolavirus where such tools played a key role. These combined factors explain why the epidemic is growing at an unusually rapid rate.