A D Harries1, J M Chakaya2. 1. International Union Against Tuberculosis and Lung Disease, Paris, France, Department of Clinical Research, Faculty of Infectious and Tropical Diseases, London School of Hygiene & Tropical Medicine, London, UK. 2. International Union Against Tuberculosis and Lung Disease, Paris, France, Department of Medicine, Therapeutics, Dermatology and Psychiatry, Kenyatta University, Nairobi, Kenya.