1 Infection Care Group, St George's University Hospitals NHS Foundation Trust, London, UK. Electronic address: Ciara.O'Connor1@nhs.net.
2 Infection Care Group, St George's University Hospitals NHS Foundation Trust, London, UK; Institute for Infection & Immunity, St George's, University of London, London, UK.
3 Infection Care Group, St George's University Hospitals NHS Foundation Trust, London, UK; National Infection Service, Public Health England, Skipton House, London, UK.
4 Infection Care Group, St George's University Hospitals NHS Foundation Trust, London, UK.
5 St George's Vascular Institute, St George's University Hospitals NHS Foundation Trust, London, UK.
6 Infection Prevention and Control Team, St George's University Hospitals NHS Foundation Trust, London, UK.