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Is stratified shielding from covid-19 feasible and ethical?

The concept of stratified shielding from covid-19 is interesting but complex and potentially unethical to implement in practice. As described by Davey Smith and Spiegelhalter,1 the risk of covid-19 mortality can be described as a two step process: the risk of getting infected and the risk of dying after infection.

In theory, it would be relatively straightforward to derive a risk prediction …