Disease X, a hypothetical yet plausible pathogen, could lead to a global health crisis. Experts stress the urgency of ...

Four weeks after a puzzling outbreak was reported in the Democratic Republic of Congo, the World Health Organization has identified the cause.

The Africa Centers for Disease Control and Prevention dubbed it "Disease X." National and international health experts raced to the scene. But because the rainy season made dirt roads hard to pass ...

There are also the unknown unknowns, or "disease X" — an unknown pathogen with the potential to trigger a severe global epidemic. To prepare for this, we need to adopt new forms of surveillance ...