The World Health Organization says the Ebola outbreak in eastern Congo continues to spread faster than health authorities can detect and respond. WHO’s emergencies chief said that a large share of newly reported cases are linked to “unknown chains of transmission,” indicating that transmission routes are not being fully identified even as the response expands. Multiple reports cite a specific figure: about 80% of new cases are emerging from these unknown chains. The WHO official also warned that the outbreak outpaces response efforts, based on updates gathered after a trip to Bunia in Ituri province, an area described as among the worst affected. Several outlets note that new information suggests ongoing transmission and a continuing challenge for contact tracing and case investigation. The reporting also highlights concern about the severity of the toll, with some mention that newly reported deaths include people who had not previously been traced through known transmission pathways. Overall, the accounts converge on the same central point: in eastern Congo, most recent Ebola spread is occurring through transmission links that health systems cannot yet map reliably.