1. 1 PHE South East, Surrey and Sussex HPT, Parkside, Chart Way, Horsham RH12 1XA, UK
2. 2 Gastrointestinal Bacteria Reference Unit, Public Health England, 61 Colindale Avenue, London NW9 5HT, UK
3. 3 PHE South East, Thames Valley HPT, Chilton, Oxon, OX11 0RQ, UK
4. 4 Field Services, National Infection Service, Public Health England, London, UK