Effectiveness of mRNA BNT162b2 COVID-19 vaccine up to 6 months in a large integrated health system in the USA: a retrospective cohort study User peetss, in the Reddit Science subreddit, 12 Oct 2021
[Discussion] Efficacy in protecting from COVID-19 infection drops significantly after 5 to 7 months. Protection from severe infection still holds strong at 90% as seen with data collected from over 4.9 million individuals by Kaiser Permanente Southern California User mild_salsa_dip, in the LeftvsRightDebate subreddit, 08 Oct 2021