目的明确我院分离的流感嗜血杆菌(HI)氨苄西林耐药的基因。方法用 E 试验测定我院上呼吸道感染患儿鼻咽部分离300株 HI 对氨苄西林耐药情况;以 Nitrocefin 纸片检测β内酰胺酶;PCR 扩增及序列分析确定产酶株的基因型。结果31株氨苄西林...目的明确我院分离的流感嗜血杆菌(HI)氨苄西林耐药的基因。方法用 E 试验测定我院上呼吸道感染患儿鼻咽部分离300株 HI 对氨苄西林耐药情况;以 Nitrocefin 纸片检测β内酰胺酶;PCR 扩增及序列分析确定产酶株的基因型。结果31株氨苄西林耐药株均产β内酰胺酶,占总菌株数11%(32/300),PCR 检测出 TEM-1 31株,ROB-1 1株。结论产β内酰胺酶是 HI 对氨苄西林耐药的重要机制,TEM-1型是β内酰胺酶主要基因型,ROB-1型β内酰胺酶也首次被检出,值得关注和长期监测。展开更多
Background Acinetobacter baumanii （A. baumanii ） remains an important microbial pathogen resulting in nosocomialacquired infections with significant morbidity and mortality. The mechanism by which nosocomial bacteri...Background Acinetobacter baumanii （A. baumanii ） remains an important microbial pathogen resulting in nosocomialacquired infections with significant morbidity and mortality. The mechanism by which nosocomial bacteria, like A. baumanii, attain multidrug resistance to antibiotics is of considerable interest. The aim in this study was to investigate the spread status of antibiotic resistance genes, such as multiple 13-1actamase genes and aminoglycoside-modifying enzyme genes, from A. baumanii strains isolated from patients with lower respiratory tract infections （LRTIs）. Methods Two thousand six hundred and ninety-eight sputum or the bronchoalveolar lavage samples from inpatients with LRTIs were collected in 21 hospitals in the mainland of China from November 2007 to February 2009. All samples were routinely inoculated. The isolated bacterial strains and their susceptibility were analyzed via VITEK-2 expert system. Several kinds of antibiotic resistant genes were further differentiated via polymerase chain reaction and sequencing methods. Results Totally, 39 A. baumanii strains were isolated from 2698 sputum or bronchoalveolar lavage samples. There was not only a high resistant rate of the isolated A. baumanfi strains to ampicillin and first- and second-generation cephalosporins （94.87%, 100% and 97.44%, respectively）, but also to the third-generation cephalosporins （ceftriaxone at 92.31%, ceftazidine at 51.28%） and imipenem （43.59%） as well. The lowest antibiotic resistance rate of 20.51% was found to amikacin. The OXA-23 gene was identified in 17 strains of A. baumanii, and the AmpC gene in 23 strains. The TEM-1 gene was carried in 15 strains. PER-1 and SHV-2 genes were detected in two different strains. Aminoglycoside-modifying enzyme gene aac-3-1a was found in 23 strains, and the aac-6＂lb gene in 19 strains, aac-3-1a and aac-6＂lb genes hibernated in three A. baumanfi strains that showed no drug-resistant phenotype. Conclusions A. baumanii can carry multiple drug-resistant genes at the sam展开更多
文摘目的明确我院分离的流感嗜血杆菌(HI)氨苄西林耐药的基因。方法用 E 试验测定我院上呼吸道感染患儿鼻咽部分离300株 HI 对氨苄西林耐药情况;以 Nitrocefin 纸片检测β内酰胺酶;PCR 扩增及序列分析确定产酶株的基因型。结果31株氨苄西林耐药株均产β内酰胺酶,占总菌株数11%(32/300),PCR 检测出 TEM-1 31株,ROB-1 1株。结论产β内酰胺酶是 HI 对氨苄西林耐药的重要机制,TEM-1型是β内酰胺酶主要基因型,ROB-1型β内酰胺酶也首次被检出,值得关注和长期监测。
文摘Background Acinetobacter baumanii （A. baumanii ） remains an important microbial pathogen resulting in nosocomialacquired infections with significant morbidity and mortality. The mechanism by which nosocomial bacteria, like A. baumanii, attain multidrug resistance to antibiotics is of considerable interest. The aim in this study was to investigate the spread status of antibiotic resistance genes, such as multiple 13-1actamase genes and aminoglycoside-modifying enzyme genes, from A. baumanii strains isolated from patients with lower respiratory tract infections （LRTIs）. Methods Two thousand six hundred and ninety-eight sputum or the bronchoalveolar lavage samples from inpatients with LRTIs were collected in 21 hospitals in the mainland of China from November 2007 to February 2009. All samples were routinely inoculated. The isolated bacterial strains and their susceptibility were analyzed via VITEK-2 expert system. Several kinds of antibiotic resistant genes were further differentiated via polymerase chain reaction and sequencing methods. Results Totally, 39 A. baumanii strains were isolated from 2698 sputum or bronchoalveolar lavage samples. There was not only a high resistant rate of the isolated A. baumanfi strains to ampicillin and first- and second-generation cephalosporins （94.87%, 100% and 97.44%, respectively）, but also to the third-generation cephalosporins （ceftriaxone at 92.31%, ceftazidine at 51.28%） and imipenem （43.59%） as well. The lowest antibiotic resistance rate of 20.51% was found to amikacin. The OXA-23 gene was identified in 17 strains of A. baumanii, and the AmpC gene in 23 strains. The TEM-1 gene was carried in 15 strains. PER-1 and SHV-2 genes were detected in two different strains. Aminoglycoside-modifying enzyme gene aac-3-1a was found in 23 strains, and the aac-6＂lb gene in 19 strains, aac-3-1a and aac-6＂lb genes hibernated in three A. baumanfi strains that showed no drug-resistant phenotype. Conclusions A. baumanii can carry multiple drug-resistant genes at the sam
