1 Department of TB, International Union Against Tuberculosis and Lung Disease (The Union), Bulawayo, Zimbabwe.
2 TB, The Union Zimbabwe Trust, Harare, Zimbabwe.
3 AIDS and TB Unit, Ministry of Health and Child Care, Harare, Zimbabwe.
4 Epidemiology Group, Woolcock Institute of Medical Research, Sydney, NSW, Australia, Respiratory Medicine, Liverpool Hospital, Sydney, NSW, Australia.