Peter Doshi, PhD reported in the British Medical Journal on 21st October

2020 that the the phase III trials for Pfizer and Moderna's Covid-19 vaccines were never set up to prove a reduction in the likelihood of hospitalisation or prevention of infection and therefore disease transmission.

https://doi.org/10.1136/bmj.m4037 (Published 21 October 2020)

All credit to The Highwire who were reporting this two years ago. This is an extract from Episode 290: The Speed of Science (https://thehighwire.com/videos/in-plain-sight-how-the-highwire-got-it-right/)