1 Department of Infection, St George's University Hospitals NHS Foundation Trust, London SW17 0QT, United Kingdom; Institute of Infection and Immunity, St George's University of London, United Kingdom. Electronic address: aodhan.breathnach@stgeorges.nhs.uk.
2 Department of Infection, St George's University Hospitals NHS Foundation Trust, London SW17 0QT, United Kingdom; Institute of Infection and Immunity, St George's University of London, United Kingdom.
3 Department of Infection, St George's University Hospitals NHS Foundation Trust, London SW17 0QT, United Kingdom.