DEMOCRATIC REPUBLIC OF THE CONGO / RankWire.AI / – By August 3, Congo’s outbreak of Ebola had reached 3,874 confirmed cases and caused 1,751 deaths. This marks the largest epidemic ever recorded in the country. It ranks as the second largest worldwide, surpassed only by the 2014 to 2016 West Africa outbreak. Congo reached 1,000 confirmed cases in just 40 days after launching its response. In comparison, the 2018 outbreak took about 235 days to hit the same milestone. The rapid escalation indicates delays in detection, weak surveillance, ongoing conflict, high mobility, and the lack of approved strain-specific medical tools.
Congo’s Ministry of Public Health announced the outbreak on May 15 after testing identified Bundibugyo virus in Ituri province. The WHO first received an alert on May 5, after reports of a deadly, unexplained illness around Mongbwalu. Further investigations revealed that the virus had been circulating for months before authorities recognized the outbreak. Initial tests in Bunia did not detect Bundibugyo, as early symptoms resembled malaria and other common febrile illnesses. This delay allowed infected individuals and contacts to move through communities before isolation and contact tracing could be expanded.
The virus species also influenced the response. Vaccines and antibody treatments that are licensed target Zaire ebolavirus, which caused Congo’s 2018 to 2020 epidemic. There is no approved vaccine or specific treatment for Bundibugyo virus disease. Patients must rely on early diagnosis, isolation, supportive care, infection control, contact tracing, and safe burials. The WHO has added a Bundibugyo diagnostic test to its emergency list and begun treatment studies. However, these steps came only after the virus had already spread widely.
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 reports most infections and deaths. Bunia, Rwampara, and Mongbwalu are among the most affected zones. WHO tracked 17,863 contacts by July 30. Yet only about three-quarters of these contacts received active follow-up in several affected areas. Officials say many new cases are outside known contact chains. Surveillance teams are finding many patients only after further exposure has occurred.
Ongoing conflict and displacement make surveillance even harder. Armed attacks have restricted access, disrupted response activities, and forced some health teams to halt operations. Routes used for mining, trade, crowded displacement sites, and cross-border movement keep large groups of people moving through affected regions. Health facilities face shortages of protective equipment, laboratory services, transportation, and trained personnel. As of July 30, Congo recorded 151 infections and 44 deaths among health workers. Some front-line workers have also ceased work due to delayed or inadequate pay.
Security issues and treatment shortages hinder containment
Ebola transmits through direct contact with blood or body fluids of an infected or deceased individual. It does not spread through casual contact like influenza. Transmission increases in clinics lacking proper infection controls and during burials involving contact with infected bodies. Over 60% of recent deaths happened outside treatment centers, complicating safe burial procedures and contact investigations. Congolese health officials, WHO, and Africa CDC have expanded laboratory capacities, treatment centers, community outreach, and border surveillance. Despite these efforts, the response lags behind the growing number of cases.
Uganda declared its linked outbreak over on July 28 after 42 days without a new local case. The single case treated in France resulted in no secondary transmissions, and the patient recovered. Congo remains the focal point of ongoing transmission, with a case fatality rate of about 45% in early August. The outbreak spreads faster due to late detection, missed contact chains, and limited access caused by insecurity. The absence of approved vaccines and treatments for Bundibugyo virus removes tools that helped contain earlier Zaire Ebola outbreaks. These combined factors explain the unusually rapid increase in cases.