1 Institute of Infection and Global Health, University of Liverpool, Liverpool, UK; Department of Thoracic Medicine, Liverpool University Hospitals NHS Foundation Trust, Liverpool, UK. Electronic address: dwootton@liverpool.ac.uk.
2 Institute of Infection and Global Health, University of Liverpool, Liverpool, UK; Tropical and Infectious Diseases Unit, Liverpool University Hospitals NHS Foundation Trust, Liverpool, UK.
3 Wythenshawe Hospital, Manchester University NHS Foundation Trust, Manchester, UK; Division of Infection, Immunity and Respiratory Medicine, University of Manchester, Manchester, UK.