Voysey, M, Costa Clemens, SA, Madhi, SA, Weckx, LY, Folegatti, PM, Aley, PK, Angus, B, Baillie, VL, Barnabas, SL, Bhorat, QE, Bibi, S, Briner, C, Cicconi, P, Clutterbuck, EA, Collins, AM, Cutland, CL, Darton, TC, Dheda, K, Dold, C, Duncan, CJA et al, Emary, KRW, Ewer, KJ, Flaxman, A, Fairlie, L, Faust, SN, Feng, S, Ferreira, DM, Finn, A, Galiza, E, Goodman, AL, Green, CM, Green, CA, Greenland, M, Hill, C, Hill, HC, Hirsch, I, Izu, A, Jenkin, D, Joe, CCD, Kerridge, S, Koen, A, Kwatra, G, Lazarus, R, Libri, V, Lillie, PJ, Marchevsky, NG, Marshall, RP, Mendes, AVA, Milan, EP, Minassian, AM, McGregor, A, Mujadidi, YF, Nana, A, Padayachee, SD, Phillips, DJ, Pittella, A, Plested, E, Pollock, KM, Ramasamy, MN, Ritchie, AJ, Robinson, H, Schwarzbold, AV, Smith, A, Song, R, Snape, MD, Sprinz, E, Sutherland, RK, Thomson, EC, Török, ME, Toshner, M, Turner, DPJ, Vekemans, J, Villafana, TL, White, T, Williams, CJ, Douglas, AD, Hill, AVS, Lambe, T, Gilbert, SC, Pollard, AJ, Aban, M, Abeyskera, KWM, Aboagye, J, Adam, M, Adams, K, Adamson, JP, Adewatan, G, Adlou, S, Ahmed, K, Akhalwaya, Y, Akhalwaya, S, Alcock, A, Ali, A, Allen, ER, Allen, L, Alvernaz, FB, Amorim, FS, Andrade, CS, Andritsou, F, Anslow, R and Tahmasebi, F (2021) Single-dose administration and the influence of the timing of the booster dose on immunogenicity and efficacy of ChAdOx1 nCoV-19 (AZD1222) vaccine: a pooled analysis of four randomised trials. The Lancet, 397 (10277). pp. 881-891. ISSN 0140-6736