Testing Targets and Intensifies Social Distancing on the Infectious

I’ve been pounding on the need for fast, frequent testing but it’s clear from some of the comments to The Beginning of the End that I have failed to convey some fundamental points. A seemingly sophisticated objection is to note that given background prevalence rates even a fairly specific test will result in a high fraction of false positives among those who test positive. (This is the standard Bayesian doctor puzzle .) It’s nice to see people doing the Bayes calculation but some of them are then drawing the wrong conclusion.

Source: Testing Targets and Intensifies Social Distancing on the Infectious