Quantitative Bacteriology Study of Sputum in Patients with Lower Respiratory Tract Infection / 中华医院感染学杂志

ABSTRACT

OBJECTIVE To study the quantitative bacteriology of sputum in patients with lower respiratory tract infection. METHODS A total of 1534 samples were collected from 1351 patients.Bacterial culture,drugs sensitive test and quantitative analysis were carried out.The pathogens were confirmed by VITEK-32 and API system.MIC test was adopted to analyze drug resistance. RESULTS The 1605 strains were isolated of the 1534 samples.The common pathogens were Escherichia coli 24.3%,Klebsiella pneumoniae 20.7%,Streptococcus pneumoniae 20.7%,Enterobacter cloacae 10.9%,Staphylococcus aureus 10.4%,Haemophilus influenzae 8.7%,Pseudomonas aeruginosa 5.9%,and Moraxella catarrhalis 4.0%. CONCLUSIONS Sputum cultures usually can not accurately reflect the etiology.Diagnosis of lower respiratory tract infection is based on clinical symptoms.A sputum Gram staining may show many mononuclear or polymorphonuclear cells in viral or bacterial infections,respectively.