Table 3

Number of in vitro susceptible isolates (%)*

SpeciesNumber of isolates†MeropenemPiperacillin-tazobactamGentamicinCiprofloxacinBeta-lactamase
ESBL n=247 Escherichia coli 203203 (100)175 (86)153 (75)97 (48)na
Klebsiella pneumoniae 3534 (97)17 (49)26 (74)6 (17)na‡
Klebsiella oxytoca 66 (100)4 (67)2 (33)1 (17)na
Other§22 (100)111na
CPE n=6 E. coli 3001 (33)0OXA-48 (2),
NDM (2)¶
Other**3002 (67)0NDM (3)
  • *According to European Committee on Antimicrobial Susceptibility testing (EUCAST) breakpoints (

  • †Eleven patients were colonised with more than one ESBL-producing enterobacteria and two patients were colonised with two different CPE (different species or susceptibility pattern).

  • §One Klebsiella spp, and one Citrobacter koseri.

  • ‡One isolate of K. pneumoniae was both ESBL and New Delhi metallo-beta-lactamase (NDM) positive.

  • ¶One isolate was both oxacilinase-48 (OXA-48) and NDM positive.

  • **One Enterobacter cloacae, one K. pneumoniae and one Citrobacter freundii.

  • CPE, carbapenemase-producing enterobacteria; ESBL, extended-spectrum beta-lactamase-producing enterobacteria; na, not available.