1 Centre for Clinical Microbiology, Division of Infection and Immunity, University College London, Royal Free Hospital, London, UK. Electronic address: i.honeyborne@ucl.ac.uk.
2 University College London (UCL) Respiratory, Division of Medicine, UCL, London, UK; Royal Free Hospital London National Health Service Foundation Trust, London, UK. Electronic address: marclipman@nhs.net.
3 Centre for Clinical Microbiology, Division of Infection and Immunity, University College London, Royal Free Hospital, London, UK; UCL Hospitals and National Institute of Health Research Biomedical Research Centre at UCL Hospitals NHS Foundation Trust, London, UK. Electronic address: a.zumla@ucl.ac.uk.
4 Centre for Clinical Microbiology, Division of Infection and Immunity, University College London, Royal Free Hospital, London, UK. Electronic address: t.mchugh@ucl.ac.uk.