Preliminary investigation of the molecular mechanisms of imipenem-resistance in clinical isolates of Acinetobacter baumannii in Xi'an / 南方医科大学学报
Journal of Southern Medical University
;
(12): 1393-1396, 2009.
Artigo
em Chinês
| WPRIM
| ID: wpr-268750
ABSTRACT
<p><b>OBJECTIVE</b>To investigate the molecular mechanism of carbapenem resistance in the clinical isolates of Acinetobacter baumannii from Xi'an and their profile of carbapenemase production.</p><p><b>METHODS</b>A total of 146 Acinetobacter baumannii strains were isolated from 6 general hospitals in Xi'an. Antimicrobial susceptibility test was performed for all the strains, followed by detection of imipenem resistance using E-test for metallo-beta-lactamase (MBL) and NaCl inhibition test for OXA type carbapenemase. Bla(OXA-23)and bla(OXA-58) were amplified by PCR, and the positive products were sequenced.</p><p><b>RESULTS</b>From the collected strains, 15 non-repetitive imipenem-resistant Acinetobacter baumannii strains were identified, among which 14 yielded negative results in E-test for MBL production. All the resistant strains showed increased sensitivity to imipenem after NaCl inhibition, suggesting the presence of carbapenemase production. Eleven of the strains harbored OXA -23 type gene and 1 harbored OXA -58 type gene. The concordance rate of the results by NaCl inhibition test and PCR was 85.7%.</p><p><b>CONCLUSIONS</b>Production of OXA-type carbapenemase is the most important reason for carbapenem resistance in Acinetobacter baumannii in Xi'an. The OXA-58 type gene is a novel carbapenemase genotype in China. NaCl inhibition test is a convenient and cost-effective method for detecting carbapenemase in Acinetobacter baumannii.</p>
Texto completo:
DisponíveL
Índice:
WPRIM (Pacífico Ocidental)
Assunto principal:
Farmacologia
/
Proteínas de Bactérias
/
Beta-Lactamases
/
China
/
Imipenem
/
Resistência beta-Lactâmica
/
Acinetobacter baumannii
/
Genética
/
Antibacterianos
Limite:
Humanos
País/Região como assunto:
Ásia
Idioma:
Chinês
Revista:
Journal of Southern Medical University
Ano de publicação:
2009
Tipo de documento:
Artigo
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