Talking about herd immunity, I have to say it's always puzzled me that so many people seem to set such great store by the idea of herd immunity from CoVid-19 through natural infection, when it's normally only achieved by vaccination.
In fact unless there's something I've missed in my reading on this, there's only ever been one highly infectious disease that has shown susceptibility to being controlled by naturally-acquired herd immunity. This was with Zika (and only in one city in Brazil) where the disease appeared to subside after an estimated 50% of the population was exposed to it.
But apart from this one exception which is notable precisely for it's uniqueness, the only way herd immunity has otherwise been achieved is by vaccination, as far as I'm aware.
With all the major infectious diseases, such as smallpox, measles, polio, diphtheria etc, despite them being around for centuries if not millennia, herd immunity was never achieved by natural means. It wasn't until vaccines came along that it could be realised.
So I'm not quite sure why people think herd immunity by natural infection is even possible (let alone desirable) when the history of infectious diseases would seem to make it unlikely.