Aid agencies are racing to help health workers in the Democratic Republic of Congo. The virus is known to have killed at least 140 people, but the true toll may be far higher.

Mining has been the lifeblood of this remote Congolese hill town for decades. Now, it is fueling the spread of a devastating virus.

A remote gold mining town is under siege, as medical workers struggle to beat back a surge of deaths and infections.

To some Africans, the claim that the continent’s largest health agency had already bungled its response scratched a familiar wound.

A once-robust H.I.V. treatment and prevention system, credited with saving hundreds of thousands of lives, has begun to crumble.

As deaths from diabetes start to rival those from infectious threats like malaria, a new form of the condition linked to malnutrition is surfacing in patients who can afford neither screening nor care.