Claim: The Pfizer vaccine trial was underpowered to detect rare side effects or efficacy.
Fact-check: Critical report on BBC Newsround story is misleading - Full Fact
Verdict: it's true the study was underpowered to detect rare adverse effects although this limitation is typical of studies of its type. rare adverse effects which were recorded were unrelated to the vaccine. the data in the trial also clearly shows far fewer children who had a vaccine subsequently contracted covid-19.
Organisation: Full Fact
Author: Tom Norton
Date published: 2021-06-29T00:00:00