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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

Antimicrobial susceptibility of inducible AmpC beta-lactamase-producing Enterobacteriaceae from the Meropenem Yearly Susceptibility Test Information Collection (MYSTIC) Programme, Europe 1997-2000.

Among 11345 clinical isolates from 31 European centres in the MYSTIC (Meropenem Yearly Susceptibility Test Information Collection) Programme (1997-2000), the potential AmpC-producing pathogens were Enterobacter spp. (904 cases), Citrobacter spp. (144) and Serratia marcescens (288). Resistance to ceftazidime or cefotaxime (11-34%) and piperacillin/tazobactam (12%) was observed, indicating stably derepressed expression of AmpC cephalosporinases. Meropenem (MIC(90), 0.25 mg/l; >99% susceptible) and imipenem (MIC(90), 2 mg/l; 98% susceptible) were active, even against these stably derepressed AmpC-producers: Enterobacter spp. (305 strains), Citrobacter spp. (29) and S. marcescens (35). The overall rank order of spectrum (% susceptible) versus the stably derepressed subset of isolates was: meropenem=imipenem (98%)>cefepime (89%)>gentamicin (73%)>ciprofloxacin (62%)>tobramycin (60%) >piperacillin/tazobactam (21%). We suggest increased attention in Europe to: (1) the recognition of these resistant phenotypes, (2) infection control practices, and (3) limiting the overuse of certain selecting extended-spectrum beta-lactam agents (e.g. ceftazidime).[1]

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