Immunogenicity of single vaccination with BNT162b2 or ChAdOx1 nCoV-19 at 5–6 weeks post vaccine in participants aged 80 years or older: an exploratory analysis by Parry, Helen, MBChB, Bruton, Rachel, PhD, Tut, Gokhan, PhD, Ali, Myah, MSc, Stephens, Christine, MSc, Greenwood, David, MSc, Faustini, Sian, PhD, Hughes, Sam, MSc, Huissoon, Aarnoud, MBBCh, Meade, Rory, MBBS, Brown, Kevin, MBBChir, Amirthalingam, Gayatri, MBBS, Otter, Ashley, PhD, Hallis, Bassam, PhD, Richter, Alex, Prof, Zuo, Jianmin, PhD, Moss, Paul, Prof

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