Coronavirus: Why Delta variant has made herd immunity through vaccinations alone mathematically impossible

FROM the beginning of the pandemic, herd immunity has been touted as a sort of finish line or Holy Grail at which point the virus runs out steam and true normality returns.

Coronavirus: Why Delta variant has made herd immunity through vaccinations alone mathematically impossible
FROM the beginning of the pandemic, herd immunity has been touted as a sort of finish line or Holy Grail at which point the virus runs out steam and true normality returns.