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The objective of this study is to investigate the profile of antimicrobial resistance of Gram-negative bacteria in blood cultures from 2004-2011. Pathogens from positive blood cultures were subcultured, and identified in the First Affiliated Hospital of Nanjing Medical University from January 2004 to December 2011. The antibiotic resistance pattern was analyzed by WHONET 5.4. A total of 1224 cases of Gram-negative bacterial isolates were documented, accounting for 38.6% of the total pathogens isolated from positive blood cultures in the 8-year period. The isolation rates of Klebsiella pneumoniae and Acinetobacter baumannii increased nearly three times over the same time span. Most Gram-negative bacteria isolates, except the isolates of Pseudomonas aeruginosa, showed a significantly increased resistance rate to cephalosporins (in particular third/fourth generation cephalosporins). Noteworthy, the antimicrobial resistance of K. pneumoniae, A. baumannii and P. aeruginosa isolates to carbapenem (imipenem and meropenem) was significantly increased and the resistant rate to carbapenem was &gt;80.0% in A. baumannii in 2011. The results from PCR detection for carbapenemases were as follows: 82.8% (24/29) isolates of K. pneumoniae carried the kpc-2 gene; only three metallo-beta-lactamase-positive P. aeruginosa isolates were detected; and 93.1% (67/72) A. baumannii isolates were blaOXA-23 positive. The antimicrobial resistance rate of Gram-negative bacteria isolated from blood cultures significantly increased from 2004 to 2011, with significant resistance to the third/fourth generation cephalosporins and carbapenem.

journal of antibiotics

Increasing resistance rate to carbapenem among blood culture isolates of Klebsiella pneumoniae, Acinetobacter baumannii and Pseudomonas aeruginosa in a university-affiliated hospital in China, 2004–2011