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Some vaccinated losing more than 80% of their COVID-19 immunity six months after Pfizer shot: study https://medicalxpress.com/news/2021-09-vaccinated-covid-immunity-months-pfizer.html Three doses of Covid-19 vaccine are likely needed for full protection, Fauci says https://edition.cnn.com/2021/09/03/health/us-coronavirus-friday/index.html BNT162b2 vaccine booster dose protection: A nationwide study from Israel https://www.medrxiv.org/content/10.1101/2021.08.27.21262679v1 Short Term Reduction in the Odds of Testing Positive for SARS-CoV-2; a Comparison Between Two Doses and Three doses of the BNT162b2 Vaccine https://www.medrxiv.org/content/10.1101/2021.08.29.21262792v1.full.pdf