Risk vs. Action Equation Changed Dr. Peter Davies, University of Minnesota, shares what Porcine Epidemic Diarrhea Virus (PEDv) has taught us about our beliefs and how it connects with reality. He poses the question if biosecurity is an art or a science. And he asks how ‘leaky’ is national biosecurity? His take away: PEDv taught us nothing about biosecurity because we already knew the actions to take. But what PEDv has done is change the equation of risk vs action.