RE: Vaccine reduces hospitalisation by 84% and 95%22 Feb 2021 22:40
For those too lazy to read the link one of the more interesting comments.
“ A large proportion of adults remain who are not directly protected by vaccination; in this case:
Proportion of adults directly protected against severe disease =
85% vaccine efficacy against severe disease x 79% final coverage = 67%
25. Only around 79% of the population are adults, which means population level protection is lower, at 53% (dark green in Figure 2). In addition, protection against infection is likely to be lower than that against disease. As a result, herd immunity is not reached without a large resurgence of transmission.”