DEMOCRATIC REPUBLIC OF THE CONGO / RankWire.AI / – By August 3, Congo’s outbreak had reached 3,874 confirmed cases and 1,751 deaths, marking it as the largest epidemic ever recorded in the country. It stands as the second-largest worldwide, following the 2014 to 2016 West Africa outbreak. Congo hit 1,000 confirmed cases within 40 days after activating its response, a pace faster than its 2018 outbreak, which took approximately 235 days to reach the same number. This rapid growth highlights issues like delayed detection, weak surveillance systems, ongoing conflict, population mobility, and the lack of approved strain-specific medical interventions.
Congo’s Ministry of Public Health announced the outbreak on May 15 after testing identified Bundibugyo virus in Ituri province. The WHO was first alerted on May 5, following reports of a deadly, unidentified illness near Mongbwalu. Further investigations revealed that the virus had been circulating for months before authorities officially recognized the outbreak. Initial testing in Bunia did not identify Bundibugyo, as early symptoms resembled malaria and other common febrile illnesses. The delay in detection allowed infected individuals and contacts to move through communities before isolation and contact tracing efforts could be scaled up.
The virus strain also influenced the response strategies. While licensed Ebola vaccines and proven antibody treatments target Zaire ebolavirus, responsible for Congo’s 2018 to 2020 epidemic, there are no approved vaccines or specific treatments for Bundibugyo virus disease. Consequently, patient care relies heavily on early diagnosis, isolation, supportive treatment, infection prevention measures, contact tracing, and safe burial practices. The WHO has added a Bundibugyo diagnostic test to its emergency list and initiated treatment research, but these steps came only after the virus had 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 highest number of infections and deaths, with Bunia, Rwampara, and Mongbwalu among the most severely affected areas. WHO tracked 17,863 contacts by July 30, but only about 75% of those received active follow-up in several impacted provinces. Authorities also note that many new cases are identified outside known contact chains. Surveillance teams often discover new patients only after additional exposures have occurred.
Ongoing conflict and population displacement hinder effective surveillance. Armed attacks have restricted access, disrupted response operations, and caused some health teams to cease activities. Movement along mining routes, trade corridors, crowded displacement sites, and cross-border travel continues to facilitate the spread. Healthcare facilities face shortages of protective gear, laboratory access, transportation, and trained personnel. As of July 30, Congo had reported 151 infections and 44 deaths among health workers. Frontline staff have also halted work in certain areas due to delayed or insufficient compensation.
Conflict and treatment limitations challenge containment efforts
Ebola transmission occurs through direct contact with blood or body fluids of infected or deceased individuals. It does not spread via casual proximity like influenza. Transmission risk increases in clinics lacking proper infection control and during burials involving contact with infected bodies. Over 60% of recent fatalities happened outside treatment facilities, complicating efforts for safe burial and contact tracing. To address this, Congo’s health authorities, WHO, and Africa CDC have expanded laboratory capacity, treatment centers, community outreach, and border surveillance. Nonetheless, these measures still lag behind the scale and speed of new cases.
Uganda declared the end of its linked outbreak on July 28, after 42 days without a new locally transmitted case. The single case identified was successfully treated in France, with no secondary transmissions, and the patient recovered. Congo remains the epicenter of ongoing transmission, with a case fatality rate of around 45% in early August. The outbreak’s accelerated spread is attributed to late detection, the inability to trace many chains of contact, and limited access caused by insecurity. The absence of approved vaccines and treatments for Bundibugyo virus—unlike the tools available for earlier Zaire Ebola outbreaks—further contributes to the rapid case growth. These combined factors account for the unusual speed at which cases are increasing.