SolT there is no herd immunity against the coronavirus anywhere in the world....and it won`t happen till there is an effective vaccine that is given to 95% of the world in a relatively short window of time.
There is mounting evidence that CV antibodies fade after several months .
The flu vaccine is only good for 70% of the population, what makes you think this one will be better. The covid-19 does not even effect 30% of the population.
As for herd immunity, I was using NY & NJ as an example to their drastic reduction in cases because a majority of those to catch it ( it you are meant to catch this you will be it now or in 6 months ) have caught it.
I would like to see a study of people who had the virus catching it again and then dying, my guess is no one or an ultra low number.