Immunogenicity and safety of beta variant COVID-19 vaccine AZD2816 and AZD1222 (ChAdOx1 nCoV-19) as primary-series vaccination for previously unvaccinated adults in Brazil, South A... by Costa Clemens, SA, Jepson, B, Bhorat, QE, Ahmad, A, Akhund, T, Aley, PK, Bansal, H, Bibi, S, Kelly, EJ, Khan, M, Lambe, T, Lombaard, JJ, Matthews, S, Pipolo Milan, E, Olsson, U, Ramasamy, MN, Moura de Oliveira Paiva, MS, Seegobin, S, Shoemaker, K, Szylak, A, Villafana, T, Pollard, AJ, Green, JA