If everybody has had the disease, what's the purpose of having full immunity? However, I think this is right in one sense: an implicit or explicit strategy of

If everybody has had the disease, what's the purpose of having full immunity? However, I think this is right in one sense: an implicit or explicit strategy of keeping R0 as close as possible to 1 would be the strategy with the highest risk of significant mutations, as we have seen. UK government ministers literally stated this to be their strategy.