University of Edinburgh, University of Bristol - Population Health Sciences, University of Edinburgh, University of Oxford, Queen's University Belfast, National Health Service (NHS), Leicester Royal Infirmary, University College London, University of Oxford - Centre for Vaccinology and Tropical Medicine, University of the West of England (UWE), University of Edinburgh, Queen's University Belfast, Royal Belfast Hospital for Sick Children - Emergency Department and Leicester University

Queen's University Belfast, University of Edinburgh, University of Oxford, Queen's University Belfast, National Health Service (NHS), Leicester Royal Infirmary, University College London, University of Oxford - Centre for Vaccinology and Tropical Medicine, University of the West of England (UWE), University of Edinburgh, Royal Belfast Hospital for Sick Children - Emergency Department, University of Edinburgh, University of Bristol - Population Health Sciences, Leicester University and Independent

Royal Belfast Hospital for Sick Children - Emergency Department, Queen’s University - Wellcome Wolfson Institute for Experimental Medicine, Royal Belfast Hospital for Sick Children, Royal Belfast Hospital for Sick Children, Royal Belfast Hospital for Sick Children, Public Health England - Immunisation and Countermeasures Division, Queen’s University - Wellcome Wolfson Institute for Experimental Medicine, Public Health England - Immunisation and Countermeasures Division, Royal Belfast Hospital for Sick Children - Emergency Department, Public Health England - Immunisation and Countermeasures Division, Cardiff and Vale University Health Board, Royal Belfast Hospital for Sick Children, Public Health England - Immunisation and Countermeasures Division, Royal Hospital for Children, Public Health England - Virus Reference Department, Public Health England, Queen's University Belfast - Mathematical Sciences Research Centre, Public Health England - Immunisation and Countermeasures Division, Queen's University Belfast - Mathematical Sciences Research Centre, Royal Belfast Hospital for Sick Children, Public Health England - Immunisation, Hepatitis, and Blood Safety Department, Public Health England - Immunisation and Countermeasures Division and Public Health England - Immunisation and Countermeasures Division