Efficacy of ChAdOx1 nCoV-19 (AZD1222) vaccine against SARS-CoV-2 lineages circulating in Brazil by Clemens, SAC, Folegatti, PM, Emary, KRW, Weckx, LY, Ratcliff, J, Bibi, S, Verena De Almeida Mendes, A, Milan, EP, Pitella, A, Schwarzbold, AV, Sprinz, E, Aley, PK, Bonsall, D, Fraser, C, Fuskova, M, Gilbert, SC, Jenkin, D, Kelly, S, Kerridge, S, Lambe, T, Marchevsky, NG, Mujadidi, YF, Plested, E, Ramasamy, MN, Simmonds, P, Golubchik, T, Voysey, M, Pollard, AJ