KINSHASA, Democratic Republic of the Congo — The Ebola outbreak sweeping the Democratic Republic of the Congo has reached a new and potentially concerning stage after authorities confirmed the virus in Sud-Ubangi province, bringing the outbreak’s geographic spread to seven provinces.
The latest development is significant because Sud-Ubangi is in northwestern Congo, far from the eastern provinces where the outbreak had previously been concentrated. The province also borders the Central African Republic and the Republic of the Congo, raising concerns about the possibility of further cross-border transmission.
The case involves the Bundibugyo species of Ebola virus, the relatively rare strain responsible for the current outbreak. According to officials cited by The Associated Press, laboratory testing by Congo’s National Institute of Biomedical Research detected the virus in a sample linked to the new case in Sud-Ubangi.
Cases have now surpassed 7,000
The outbreak has been expanding rapidly since it was first detected in northeastern Ituri province earlier this year.
Government figures reported on September 11 showed 7,022 confirmed cases and 3,398 deaths in Congo. Reuters reported that the outbreak has now become the largest and deadliest Ebola outbreak in Congo’s history, surpassing the country’s 2018–2020 epidemic.
The figures also place the Congo outbreak second only to the massive 2014–2016 West Africa Ebola epidemic, which infected more than 28,000 people and killed more than 11,000 across Guinea, Liberia and Sierra Leone.
The World Health Organization had reported 6,757 confirmed cases and 3,267 deaths as of September 7, before the latest government figures were released, illustrating how quickly the situation has been changing.
Why the seventh province matters
Sud-Ubangi is geographically separated from the six provinces that had previously reported cases: Ituri, North Kivu, South Kivu, Haut-Uélé, Bas-Uélé and Tshopo.
That makes the new detection particularly concerning for health authorities because it suggests the virus is no longer confined to the outbreak’s main eastern corridor. Officials have begun contact tracing to determine how the virus reached the province and whether additional infections occurred.
The World Health Organization has warned that continued population movement, including travel through informal border crossings, could facilitate further international spread. Surveillance and health screening remain in place at airports, ports and official land crossings.
Ituri remains the epicenter
Despite the geographic expansion, Ituri remains the heart of the outbreak.
WHO data showed that Ituri had recorded more than 5,400 confirmed cases by September 7, accounting for the overwhelming majority of Congo’s infections. North Kivu has also seen substantial transmission, while cases have continued to be detected in Haut-Uélé and other affected provinces.
WHO’s latest epidemiological reporting described the outbreak as increasingly complex, with transmission patterns differing sharply from one province and health zone to another.
Response faces major obstacles
Health authorities are confronting the outbreak amid insecurity, displacement, population movement and shortages of trained personnel and funding.
WHO has warned that these challenges are creating bottlenecks in the Ebola response, particularly as the disease expands into new geographic areas.
Congo and its international partners have also launched a revised 180-day response plan designed to strengthen coordination, expand response operations and accelerate efforts to stop transmission. Africa CDC said the plan puts communities at the center of the response while seeking stronger support for frontline health workers and affected areas.
Vaccine challenge
Another complication is that the current outbreak is caused by Bundibugyo virus, rather than the Zaire species responsible for many previous Ebola outbreaks.
The licensed Ervebo vaccine has been used to protect frontline workers during the current emergency, but WHO has noted that Bundibugyo is a different Ebola species and that there is no licensed vaccine or specific treatment specifically approved for Bundibugyo virus disease. Clinical trials for vaccine candidates are underway.
Uganda, meanwhile, declared its own Bundibugyo Ebola outbreak over in August after completing the required 42-day period without a new confirmed case. The country recorded 20 confirmed cases, including two deaths, during that outbreak.
A widening public-health emergency
WHO has described the Congo outbreak as a serious international public-health concern and has emphasized the importance of cross-border coordination as the virus continues to move through highly mobile populations.
With confirmed infections now exceeding 7,000, deaths approaching 3,400, and the virus appearing in a seventh province far from the original epicenter, authorities face a race against time to determine whether the Sud-Ubangi case is an isolated introduction—or the beginning of another chain of transmission.
The next phase of contact tracing and surveillance could determine just how far this outbreak has already traveled.
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