The covid vaccine loses its potency after 90 days according to a study done by British Medical Journal User TheAndredal, in the Kotaku In Action 2: the official Gamergate subreddit subreddit, 29 Nov 2021
Elapsed time since BNT162b2 vaccine and risk of SARS-CoV-2 infection: test negative design study User icloudbug, in the COVID-19 subreddit, 29 Nov 2021
Elapsed time since BNT162b2 vaccine and risk of SARS-CoV-2 infection: test negative design study User loopfission, in the Covid19Australia subreddit, 28 Nov 2021