Unlocking the Lockdown

I think that there is a lot of truth in Jonathan Freedland's article on the difficulties of leaving the crude 'solution' of a lockdown (https://www.theguardian.com/commentisfree/2020/apr/17/political-imagination-end-lockdown-mass-testing-contact-tracing). The question is, in deed, not "when?" but "when is it safe to emerge"? The answer to the political question must, as he says lay, at least partially, in increased testing and some form of contact tracing (as advocated by the WHO). The understandable flaw in the article is the suggestion (from a cited Economics expert, with probably little experience of the 'joys' of medical screening) that testing of key personnel (medics, nurses, teachers, care-givers and, perhaps, even restaurant staff) might have to be given 'at the start of each shift'. Although the tests are getting faster and faster, there is still going to be a delay between administering the procedure and getting the result. What was difficult becomes even more problematical. We are unlikely, in my view, to get to a situation where we can say it's totally safe to emerge but we will have to leave lockdown at some point.