DEMOCRATIC REPUBLIC OF THE CONGO / RankWire.AI / – Congo’s Ebola outbreak had reached 3,874 confirmed cases and 1,751 deaths by August 3, making it the country’s largest recorded epidemic. It is only second worldwide to the 2014 to 2016 West Africa outbreak. Congo hit 1,000 confirmed cases within 40 days of activating its response. In comparison, its 2018 outbreak took approximately 235 days to reach the same number. The swift increase indicates delays in detection, inadequate surveillance, ongoing conflict, high mobility, and the lack of approved strain-specific medical countermeasures.
Congo’s Ministry of Public Health announced the outbreak on May 15 after testing identified Bundibugyo virus in Ituri province. WHO received its first alert on May 5, following reports of a deadly, unexplained illness around Mongbwalu. Later investigations revealed the virus had circulated for months before officials identified the outbreak. Initial tests conducted in Bunia did not detect Bundibugyo, as symptoms initially resembled malaria and other common febrile illnesses. This delay in diagnosis allowed infected individuals and contacts to move freely through communities before isolation and contact tracing could be scaled up.
The difference in virus species also impacted the available response options. Licensed Ebola vaccines and proven antibody treatments target Zaire ebolavirus, responsible for Congo’s epidemic from 2018 to 2020. Currently, there are no approved vaccines or specific treatments for Bundibugyo virus disease. As a result, patients rely on early diagnosis, isolation, supportive care, infection control measures, contact tracing, and safe burial practices. The WHO has added a Bundibugyo diagnostic test to its emergency list and begun treatment studies, but these steps were taken after transmission had already spread extensively.
Delayed detection has overwhelmed contact tracing efforts
The outbreak has expanded from Mongbwalu to 49 health zones across Ituri, North Kivu, South Kivu, Haut-Uele, and Tshopo. Most infections and deaths are concentrated in Ituri, with Bunia, Rwampara, and Mongbwalu among the hardest-hit areas. WHO tracked 17,863 contacts by July 30, but only about three quarters of these received active follow-up in several affected provinces. Officials also note that many new cases are occurring outside known contact chains. Surveillance teams often identify patients only after further exposure has taken place.
Ongoing conflict and displacement hamper surveillance efforts. Armed attacks have restricted access, disrupted response activities, and forced some health teams to halt operations. Movement along mining routes, trade corridors, crowded displacement sites, and across borders continues to facilitate the spread of the virus. Healthcare facilities face shortages of protective equipment, laboratory access, transportation, and trained personnel. By July 30, Congo reported 151 infections and 44 deaths among health workers. Frontline staff have also ceased working in certain areas due to delayed or insufficient pay.
Conflict and gaps in treatment capacity hinder containment efforts
Ebola transmission occurs through direct contact with the blood or body fluids of infected or deceased individuals. It does not spread easily through casual proximity like influenza. The risk of transmission increases in clinics lacking strict infection control and during burials involving contact with infected bodies. More than 60% of recent deaths happened outside treatment centers, complicating safe burial procedures and contact investigations. To address this, Congo’s health authorities, WHO, and Africa CDC have expanded laboratories, treatment centers, community outreach, and border surveillance. Despite these efforts, the response remains insufficient given the scale and speed of new infections.
Uganda declared its linked outbreak over on July 28, after 42 days without a new local transmission case. The single case treated in France did not lead to secondary transmission, and the patient recovered. Meanwhile, Congo continues to experience sustained transmission, with an early August confirmed case fatality rate of about 45%. The outbreak’s faster spread is attributed to late detection, ineffective contact tracing, and restricted access due to insecurity. The absence of approved vaccines and treatments for Bundibugyo virus removes vital tools that helped contain previous Zaire Ebola outbreaks. These combined factors contribute to the unusually rapid increase in cases.