University of Bristol - Population Health Sciences, University of Bristol - Department of Mathematics, Pfizer, Inc. - Vaccines Medical Development & Scientific Affairs, Pfizer, Inc. - Vaccines Medical Development & Scientific Affairs, University Hospitals Bristol NHS Foundation Trust - Clinical Research and Imaging Centre, University of Bristol - Academic Respiratory Unit, University of Bristol - Department of Population Health Sciences, University of Bristol - Population Health Sciences, University of Bristol - Department of Population Health Sciences, Pfizer, Inc., Pfizer, Inc., University of Bristol - Bristol Vaccine Centre, Pfizer, Inc., Pfizer, Inc., Pfizer, Inc., Pfizer, Inc., University of Bristol - Department of Population Health Sciences, University of Bristol - Academic Respiratory Unit, Pfizer Inc. - Medical and Scientific Affairs, University of Bristol - Engineering Mathematics and University of Bristol - Bristol Vaccine Centre

University of Bristol - Population Health Sciences, University of Bristol - Academic Respiratory Unit, University Hospitals Bristol NHS Foundation Trust - Clinical Research and Imaging Centre, Public Health England - Immunisation and Countermeasures Division, Government of the United Kingdom - Microbiology Services, Southmead Hospital - North Bristol NHS Trust, Government of the United Kingdom - Microbiology Services, Government of the United Kingdom - North Bristol NHS Trust, UK Health Security Agency, Government of the United Kingdom - Microbiology Services, University of Bristol - Engineering Mathematics, Government of the United Kingdom - Microbiology Services, Public Health England - Immunisation and Countermeasures Division, University of Bristol - Bristol Vaccine Centre and University of Bristol - Academic Respiratory Unit