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A major humanitarian development now meets the alert threshold.

What happened: The Democratic Republic of Congo’s Ebola outbreak has reached Bas-Uele, a sixth province, after an infected motorcycle-taxi driver traveled from Haut-Uele to the provincial capital, Buta, sought care at several hospitals, and died. Officials are concerned that his movements—and attempts by colleagues to retrieve his body—may have exposed additional people. (Reuters)

Human cost: The outbreak has already caused more than 2,100 deaths from over 4,500 confirmed cases. WHO reported 4,381 confirmed cases and 2,011 deaths as of August 9; newer reporting indicates the toll has continued rising rapidly. (WHO | Regional Office for Africa)

Why it matters: This is now the fastest-growing Ebola outbreak on record, and WHO has warned it is on a trajectory that could eventually surpass the 2014–2016 West Africa epidemic in deaths if transmission is not brought under control. The Bundibugyo strain driving this outbreak has no approved vaccine or specific treatment currently in routine use, although vaccine and treatment trials are underway. (AP News)

The most dangerous shift is geographical. Much of the outbreak has been concentrated in eastern Congo, especially Ituri. A confirmed death hundreds of kilometers farther west demonstrates that infected people can move beyond established surveillance zones before being detected. Conflict, weak infrastructure, unpaid health workers and substantial population movement are making contact tracing and containment unusually difficult. (AP News)

What changed: The outbreak itself was already severe. The alert-worthy development is its spread into another province through an infected traveler with multiple potential exposure points, increasing the danger of a much wider national—and potentially cross-border—epidemic. (Reuters)