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, marking the largest epidemic recorded in the country. It ranks second globally only to the West Africa outbreak from 2014 to 2016. Congo hit 1,000 confirmed cases within just 40 days after initiating its response efforts. For comparison, the 2018 outbreak took approximately 235 days to reach the same milestone. This rapid increase highlights challenges 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 announced the outbreak on May 15, after testing identified Bundibugyo virus in Ituri province. The WHO initially received an alert on May 5, following reports of a deadly, unexplained illness around Mongbwalu. Later investigations revealed the virus had been circulating for months before officials confirmed the outbreak. Early testing in Bunia failed to identify Bundibugyo, as initial symptoms resembled malaria and other common febrile diseases. This delay enabled infected individuals and contacts to move freely within communities before containment measures could be implemented and contact tracing expanded.
The emergence of a different virus strain also impacted available response strategies. Vaccines and antibody treatments proven effective against Zaire ebolavirus—responsible for Congo’s 2018 to 2020 outbreak—are not approved for Bundibugyo virus disease. Consequently, patients rely on early diagnosis, isolation, supportive medical care, infection prevention, contact tracing, and safe burial practices. The WHO has added a Bundibugyo diagnostic test to its emergency list and initiated treatment trials, but these steps occurred after the virus had already spread widely.
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 remains the most affected region, with Bunia, Rwampara, and Mongbwalu among the hardest-hit areas. WHO recorded 17,863 contacts by July 30, but only about 75% of these received active follow-up in several provinces. Officials also note that many new cases are occurring outside established contact chains. Surveillance teams are only identifying many infected individuals after they have already been exposed to others.
Ongoing conflict and displacement exacerbate the difficulties in surveillance. Armed attacks have restricted access, disrupted response activities, and caused some health teams to suspend operations. Large populations continue moving through mining routes, trade corridors, crowded displacement sites, and across borders, complicating containment. 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 ceased work in certain locations due to delayed or insufficient compensation.
Security issues and treatment limitations hinder containment efforts
Ebola transmission primarily occurs through direct contact with the blood or bodily fluids of an infected or deceased person. It does not spread through casual proximity like influenza. Transmission risk increases in clinics with poor infection control and during burials involving contact with infected bodies. Over 60% of recent fatalities happened outside treatment centers, complicating safe burial practices and contact tracing. To address this, Congo’s health authorities, WHO, and Africa CDC have expanded laboratory capacity, treatment centers, community outreach programs, and border surveillance. Nonetheless, the response efforts still lag behind the rapid pace of new infections.
Uganda declared its related outbreak over on July 28 after 42 days without a new case. The single case treated in France resulted in no secondary transmissions, and the patient recovered. In contrast, Congo remains the primary site of ongoing transmission, with a confirmed case fatality rate of about 45% in early August. The outbreak’s acceleration is attributed to late detection, incomplete contact tracing, and security challenges limiting access. The absence of approved vaccines and treatments for Bundibugyo virus, unlike those available for Zaire Ebola, further hampers containment. These combined factors explain the unprecedented speed at which cases are increasing.