About the Authors

Thomas Ward

Roles Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Project administration, Resources, Software, Supervision, Validation, Visualization, Writing – original draft, Writing – review & editing

tom.ward@dhsc.gov.uk

Affiliations Public Health England, London, United Kingdom, Joint Biosecurity Centre, London, United Kingdom

Alexander Johnsen

Roles Data curation, Formal analysis, Investigation, Methodology, Project administration, Software, Visualization, Writing – original draft, Writing – review & editing

Affiliation Department of Health and Social Care, London, United Kingdom

Competing Interests

The authors have declared that no competing interests exist. The authors were employed by the Department of Health and Social Care but received no specific funding for this study.