With Delta, Herd Immunity is No Longer Possible
Published in
3 min readAug 16, 2021
The Delta variant has a basic reproductive number of 7, according to best estimates. This means that the average person infects 7 other people over the course of their infection.
When people get vaccinated or antibodies, the actual reproductive number goes down, both because some people who would’ve gotten infected are now protected:
