It is the dark side of our ever more modern world: The more mobile we are, the more globalized we are, the more connected we are... the more vulnerable we are to threats, attacks and disease. In a way, we are victims of our own remarkable progress. But these experts speak to a more virulent sort of disease: that is, the malevolent intent of some people to inflict harm, devastation and death on others, and to use disease as agents of such via bioterrorism.
As I argued in one discussion on Google+, we must account for both epidemiology (analytic and demographic picture) and phenomenology (human experience and intent) in order to grasp disease fully and sustain measures of victory over it.
Note: In the DVD for `The Invasion (2007), the fourth film adaptation of the classic Jack Finney novel `The Body Snatchers, We've Been Snatched Before is a feature program. I couldn't find an upload of it on YouTube, so the next best thing, I thought, was to capture this thought-provoking program via the foregoing screen shots.