Putting the viruses of the world into a panopticon is no longer impossible

TO KEEP AN eye on how a single pathogen navigates, mutation by mutation, through a worldwide landscape of adaptation would have been unthinkable more than ten years ago. In the face of a pandemic, it has proved possible. Now, to forestall future pandemics, some researchers want to go much further. There are 264 virus species known to infect humans. Why not track them all?