Affiliations

• ¹ UK Field Epidemiology Training Programme, UK Health Security Agency, London, UK; Field Service South West, Field Services Directorate, UK Health Security Agency, Bristol, UK.
• ² Real-time Syndromic Surveillance Team, Field Services Directorate, UK Health Security Agency, Birmingham B2 4BH, UK; National Institute for Health Research Health Protection Research Unit in Emergency Preparedness and Response, King's College London, London, UK.
• ³ Real-time Syndromic Surveillance Team, Field Services Directorate, UK Health Security Agency, Birmingham B2 4BH, UK; National Institute for Health Research Health Protection Research Unit in Gastrointestinal Infections, University of Liverpool, Liverpool, UK.
• ⁴ Field Service South West, Field Services Directorate, UK Health Security Agency, Bristol, UK; National Institute for Health Research Health Protection Research Unit in Emergency Preparedness and Response, King's College London, London, UK; National Institute for Health Research Health Protection Research Unit in Behavioural Science and Evaluation, University of Bristol, Bristol, UK.
• ⁵ Immunisation and Vaccine Preventable Diseases Division, UK Health Security Agency, London, UK.
• ⁶ Real-time Syndromic Surveillance Team, Field Services Directorate, UK Health Security Agency, Birmingham B2 4BH, UK; National Institute for Health Research Health Protection Research Unit in Emergency Preparedness and Response, King's College London, London, UK; National Institute for Health Research Health Protection Research Unit in Gastrointestinal Infections, University of Liverpool, Liverpool, UK.
• ⁷ Real-time Syndromic Surveillance Team, Field Services Directorate, UK Health Security Agency, Birmingham B2 4BH, UK; National Institute for Health Research Health Protection Research Unit in Emergency Preparedness and Response, King's College London, London, UK; National Institute for Health Research Health Protection Research Unit in Gastrointestinal Infections, University of Liverpool, Liverpool, UK. Electronic address: alex.elliot@ukhsa.gov.uk.