There are some very illogical theories of an exit strategy. The most illogical and dangerous is that recovered Covid sufferers could be given certificates of immunity and go forth to rescue society. Firstly, this would create first and second class citizens and the same principle could be extended to using genetic testing to discriminate against those at heightened risk of other diseases, a profound threat to everyone who doesn't own a large chunk of a health insurance company. Secondly, it would incentivise people to catch the disease to become first class citizens. Thirdly, it cannot be done because reliable antibody testing is not available and is currently unlikely to be sufficiently proved on a short enough timescale. Fourthly, by the time you have identified a large enough number of immune people to be economically useful in recovery, you would be getting up towards 60% immunity above which the disease cannot spread and it is safe for everyone to come back out, i.e. this approach is not economically helpful. Fifthly, you would delay low risk groups catching mild cases and getting us towards the 60% immunity level, so you would perpetuate the duration of the crisis. The only sensible early way out is to release low risk people from lock-down as soon as possible and to allow 60% immunity to be approached. This should be facilitated by identifying high risk groups more accurately using the growing death statistics. In particular, it is obvious that the omission of people with a heavy smoking history from high risk groups is a terrible mistake, as witness the case of poor old Boris Johnson.
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