few comments on the South African study - funded by a competitor (Janssen). Please remember there is a lot of money to be made from vaccines and consider every report with a "what is it in for them" mindset.
Underpowered - a small study so wide confidence intervals. The young rarely get seriously ill so even if they had intended to look at hospitalistions (they didnt) it wouldnt have shown up a small benefit.
Used a dosage regime now known to be less effective so not in use here.
Still raring to get my vaccine.