Not to nitpick here but I think you are conflating organizations being prepared (which they are) with being prepared for a pandemic (which they aren't). Noone is prepared for a pandemic where millions get ill and between 1-15% of the infected die; even to build that much capacity into the healthcare system for something that might happen once every 100 years is not feasible, to say nothing about ensuring transportation, food supply, power, law and order etc remains up and running when a large % of the workforce is either off or avoiding others. It can't really be practiced for either, unlike normal disasters.