Differential immunogenicity of BNT162b2 or ChAdOx1 vaccines after extended-interval homologous dual vaccination in older people. - Parry, Helen; Bruton, Rachel; Stephens, Christine; Brown, Kevin; Amirthalingam, Gayatri; Otter, Ashley; Hallis, Bassam; Zuo, Jianmin; Moss, Paul (Immunity & Ageing, 2021)