Public Health England Colindale, Government of the United Kingdom - Public Health England, Government of the United Kingdom - Public Health England, Government of the United Kingdom - Public Health England, Public Health England - Immunisation and Countermeasures Division, Government of the United Kingdom - Public Health England, University College London - Department of Computer Science, Public Health England Colindale, Government of the United Kingdom - Public Health England, Government of the United Kingdom - Public Health England, Government of the United Kingdom - Public Health England, Government of the United Kingdom - Public Health England, Government of the United Kingdom - Public Health England, University of Oxford - Nuffield Department of Primary Care Health Sciences, University of Oxford - Nuffield Department of Primary Care Health Sciences, University of Oxford - Nuffield Department of Primary Care Health Sciences, University of Oxford - Nuffield Department of Primary Care Health Sciences, University of Oxford - Nuffield Department of Primary Care Health Sciences, Public Health England - Virus Reference Department, University of Oxford - Nuffield Department of Primary Care Health Sciences, Public Health England, Public Health England - Immunisation and Countermeasures Division, Public Health England Colindale, Public Health England - Immunisation and Countermeasures Division, Government of the United Kingdom - Public Health England, Government of the United Kingdom - Public Health England, UK Health Security Agency and Public Health England - Immunisation, Hepatitis, and Blood Safety Department