Abstract: Objective To find out the clinical occurrence and related risk factor inpatients of tuberculosis with lower respiratory tract infection.Methods Conducting retrospective analysis of pulmonary tuberculosis patients who were discharged from January 1998 to December 1999.Special record forms were filled for every pulmonary TB patients with lower respiratory tract infection.Results The occurrence rate of lower respiratory tract infection in patients of pulmonary tuberculosis was 4.9%.TB patients who were aged,with fibratic cavity,bronchiectasis or atelectasis were more likely to get lower respiratory tract infection.The high risk factors were long hospitalization duration,frequent hospitalization,malnutrition due to serious TB and long term administration of broad spectrum antibiotics.Pseudomonas aeruginosa and Klebsielia pneumoniae were the main pathogenic bacteria for infection and 48.2% of the cases were combined with fungus infection.Conclusion Clinical concern shoud be put to inpatients with pulmonary TB with lower respiratory tract infection.

Key words: Tuberculosis, pulmonary, Respiratory tract infection, Nosocomial infection