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Multicenter survey of antimicrobial resistance in gram-negative rods in belgian intensive care units in 2000-2001



Multicenter survey of antimicrobial resistance in gram-negative rods in belgian intensive care units in 2000-2001



Abstracts of the Interscience Conference on Antimicrobial Agents & Chemotherapy 43: 148



Background: To compare the in vitro activity of imipenem (IMP) to that of 11 antibiotics including: ceftazidime (CAZ), cefepime (CPM), piperacillin-tazobactam (PTZ), amikacin (AMK) and ciprofloxacin (CP). Methods: Survey of 15 general and 6 university belgian hospitals including 1638 non-duplicate, consecutive aerobic GNR isolated from 1260 patients hospitalized in ICUs for >48h between 09/00-08/01. Susceptibility testing was performed in each center by E-test and following NCCLS guidelines. Results: MIC90 (mug/ml)/% susceptible are given. A higher percentage of E. coli isolates was observed in general hospitals (24.7% vs 15.6% in univ. hospitals; p<10-5) while a higher percentage of inducible Enterobacteriaceae (IE) was observed in university hospitals (32.3% vs 26.6% in general hospitals; p=0.01). There were no significant geographical differences in the distribution of organisms nor in resistance rates except for a higher percentage of E. aerogenes isolates in the Southern part as compared to the Northern part (13.7% vs 8.6%, p=0.003) and a higher proportion of P. aeruginosa isolates resistant to CAZ and PTZ in hospitals from the Northern region. Conclusions: Multiple antimicrobial drug resistance was mainly observed in P. aeruginosa and in E. aerogenes isolates. Overall, IMI, CPM and AMK appeared as the three agents retaining the best activity against most species of GNR. No significant resistance trends were observed in comparison to three previous similar surveys performed in 1994/5, 1996/7 and 1998/9.

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