The outbreak in eastern Congo was declared on May 15. According to the latest government update cited in reporting, a total of 3,802 cases and 1,707 deaths had been recorded. Authorities and public health agencies have described this event as the fastest-growing Ebola outbreak, with fatalities mounting more rapidly than in prior major epidemics.
Africa CDC Director-General Jean Kaseya, during a visit to Bunia near the outbreak epicenter, warned that the trajectory is concerning and noted that the outbreak already ranks as the second largest ever recorded globally.
Public health officials report that an estimated 60–70% of new cases are occurring through transmission within communities rather than being identified through traced contacts. The Africa CDC has stated plainly that contact tracing is not working in the present circumstances. Factors cited include delayed tracing efforts, inability to access affected areas, and difficulty locating and monitoring exposed individuals.
The World Health Organization (WHO) reported it is monitoring more than 17,000 potential contacts, with nearly 80% of those contacts being seen daily according to the information provided. Despite monitoring efforts, the high proportion of community-acquired cases indicates significant gaps in containment measures.
The outbreak is largely concentrated in eastern Congo’s remote Ituri province, which accounts for nearly 90% of the reported cases. Cases have also been confirmed in five other provinces, including the major city of Kisangani, demonstrating geographic spread beyond the immediate epicenter.
Bunia, a town near the center of the outbreak, has been a focal point for response activities and for visits by regional and global health leaders.
The outbreak has been linked to the Bundibugyo virus. Reporting indicates that there are currently no approved vaccines or treatments specifically for this virus. That distinction has shaped the clinical and public health response, including the prioritization of trials and post-exposure strategies.
WHO regional leadership reported a major expansion in testing capacity. The agency is now testing over 2,000 samples a day, a substantial increase from about 20 tests per day earlier in the outbreak, according to the sources cited.
Expanded laboratory capacity is a critical element of the response, particularly given the challenges of locating cases and identifying transmission chains in remote and insecure areas.
Several research efforts are underway in response to the outbreak. Two clinical trials of post-exposure prophylaxis drugs are ongoing in Ituri province. Separate vaccine trials related to the event are being conducted in the United Kingdom and Canada.
Additionally, enrollment has started in a study testing two possible Ebola treatments in Ituri. The reporting notes these studies are proceeding amid difficult operational circumstances.
More than 100 health care workers have been infected since the start of the outbreak, according to the WHO. Health workers in hard-hit towns have protested conditions: in Mongbwalu, health care workers issued an ultimatum over unpaid wages, and earlier strikes over pay and dangerous working conditions were reported in Bunia.
Community mistrust has been a recurrent problem cited by public health agencies and has impeded response measures such as contact tracing, case finding, and acceptance of clinical care.
Multiple operational impediments have hampered the outbreak response. These include delayed contact tracing, restricted access to affected areas because of insecurity, attacks on health centers, and violence by armed groups and some local residents. Displacement from armed conflict and illegal mining activity have complicated efforts to locate and follow up with those who may have been exposed.
A funding gap was also noted as constraining the human and material resources needed to mount a more effective response.
Africa CDC leadership has visited the affected region to assess and coordinate response activities. WHO leadership, including WHO Director-General Tedros Adhanom Ghebreyesus, was expected to travel to the Congolese capital Kinshasa and to visit Bunia as part of international engagement with the outbreak.
Neighboring Uganda declared itself free of Ebola after discharging its last patient in mid-June, illustrating different outbreak trajectories across the region.
One central unresolved issue is that patient zero has not been identified in this outbreak. The inability to determine the initial source of the event, combined with the high proportion of community transmission, contributes to uncertainty about when the outbreak will peak.
Response teams face a complex set of challenges — limited countermeasures for Bundibugyo virus, insecure operating environments, community mistrust, health workforce strain, and funding shortfalls — all of which limit the ability to control spread and project the outbreak’s course based on the reporting provided.
Notes: The content here summarizes the facts and figures reported in the source material. Where the source did not provide additional details (for example, specific trial protocols, timelines for vaccines, or granular geographic case distributions), those details were not reported and are not included.