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: [email protected].