Department of Clinical Pathology & Immunology, Institute of Endemic Diseases, University of Khartoum, Khartoum, Sudan;
Sudanese Medical Specialization Board, Khartoum, Sudan;
Chest Diseases Department, Khartoum North Teaching Hospital, Khartoum, Sudan;
Department of Medicine, Faculty of Medicine, University of Khartoum, Khartoum, Sudan;
Latent; TB; Infections; Household; Contacts; Community; Contacts; TST;