April 2022 (Pre-print): Research published in The Lancet looks at the effectiveness of two COVID-19 vaccine doses in adolescents over time. Vaccine Effectiveness of Two-Dose BNT162b2 Over Time Against COVID-19 Symptomatic Infection and Severe Cases Among Adolescents: Test Negative Design Case Control Studies in Brazil and Scotland Florentino, P.T.V; Millington, T; Cerqueira-Silva, T; Robertson, C; et. al. The Lancet Published on: 5 April 2022 Available via: http://dx.doi.org/10.2139/ssrn.4074678 This article was published on 2024-09-24