Last week, the World Health Organization declared the year-long Ebola outbreak in Congo a global health emergency. Did they wait too long?

Neglecting human behavior when forecasting epidemics can lead to government overspending.

A delay of just one week can drastically reduce the efficacy of Ebola vaccines in highly populated areas, research in the Democratic Republic of Congo finds.

In a globally connected world, "burstiness" can ignite the wildfire-like spread of disease. Here's what that means and why it matters.