Since I wrote my post on “The Road Back from COVID19″ we have made lots of progress on two out of the three pillars: masks and tracing. Masks went from a discussion of their merits to being mandatory to wear in public in several states, including New York. Tracing went from a hodgepodge of approaches to an API supported by both Google and Apple. On the third pillar of testing, however, we are massively behind. It is by now well understood that the virus is transmissable for several days befor...