World Health Organization officials said an Ebola outbreak in the eastern Democratic Republic of Congo is spreading largely undetected this month.

The situation is critical because the lack of traceable links between patients suggests hidden chains of transmission that could accelerate the spread of the virus.

Health officials said the outbreak is currently in an expansion phase. A primary concern for the WHO is that the majority of new cases are not linked to previously identified patients [1]. This gap in tracking indicates that the virus is moving through the population without the knowledge of health monitors.

According to the WHO, four out of every five new Ebola cases are not linked to known patients [2]. This means 80% of new infections are appearing as isolated incidents, masking the true scale of the epidemic.

Because of this under-reporting, officials said the total number of cases may be two to four times higher than official figures currently indicate [3]. The disconnect between recorded data and the reality on the ground complicates efforts to contain the virus, making it harder to implement targeted quarantine and treatment measures.

Medical teams are working in the eastern provinces of the DRC to identify these missing links. The inability to trace the source of 80% [2] of new infections suggests that the virus has already established a foothold in several communities that have not yet been flagged by surveillance systems.

WHO officials said the outbreak continues to expand. The organization is calling for increased vigilance and resources to close the gap between suspected and confirmed cases to prevent a wider regional crisis.

“The outbreak may be two to four times larger than official figures indicate”

The discrepancy between official case counts and estimated infections suggests a systemic failure in contact tracing and surveillance. When 80% of cases appear without a known link, it indicates that the virus is circulating in 'silent' chains, meaning the window for containment is closing as the actual epicenter of the outbreak remains unidentified.