1. Nuffield Department of Medicine, University of Oxford, John Radcliffe Hospital, Headley Way, Headington, Oxford, OX3 9DU, UK
2. NIHR Health Protection Research Unit in Healthcare Associated Infections and Antimicrobial Resistance, University of Oxford in partnership with Public Health England, Oxford, UK
3. UK Centre for Ecology & Hydrology, MacLean Bldg, Benson Ln, Crowmarsh Gifford, Wallingford, OX10 8BB, UK
4. Thames Water, Clearwater Court, Vastern Road, Reading, RG1 8DB, UK
5. NIHR Oxford Biomedical Research Centre, The Joint Research Office, Second Floor, OUH Cowley, Unipart House Business Centre, Garsington Road, Oxford, OX4 2PG, UK
6. Department of Microbiology/Infectious diseases, Oxford University Hospitals NHS Foundation Trust, John Radcliffe Hospital, Headley Way, Headington, Oxford, OX3 9DU, UK