A graphic in The New York Times reveals that the prospect of developing 'herd immunity' to the Covid-19 virus is not at all likely.
The top left shows the infection/antibodies density that could create herd immunity. Contrast that with the density levels that now exist in New York, London, even Stockholm where there hasn't been much of a lockdown.
Herd immunity is commonly defined as "the resistance to the spread of a contagious disease within a population that results if a sufficiently high proportion of individuals are immune to the disease, especially through vaccination.
"the level of vaccination needed to achieve herd immunity varies by disease but ranges from 83 to 94 percent"