1 Centre for Lung Infection and Immunity, Division of Pulmonology, Department of Medicine and UCT Lung Institute, University of Cape Town, South Africa.
2 South African MRC/UCT Centre for the Study of Antimicrobial Resistance, University of Cape Town, South Africa.
3 Faculty of Infectious and Tropical Diseases, Department of Infection Biology, London School of Hygiene and Tropical Medicine, UK.