TABLE 2.

Prevalence of metallo-β-lactamase-producing isolates

OrganismNo. of isolates collectedNo. of isolates fulfilling MIC criteriaNo. (%) of MBL-producing isolatesc
2000a2001bTotal2000a2001bTotal2000a2001bTotal
Pseudomonas aeruginosa2,6453,5536,1981411412828 (0.3)14 (0.4)22 (0.4)
Escherichia coli1,3343,0134,34738110 (0)0 (0)0 (0)
Klebsiella pneumoniae8671,4872,3541230 (0)0 (0)0 (0)
Serratia marcescens6158141,4291015515626 (4.2)18 (2.2)44 (3.1)
Enterobacter cloacae5659181,48381901710 (0)1 (0.1)1 (0.1)
Acinetobacter spp.3887201,10820143413 (3.4)8 (1.1)21 (1.9)
Citrobacter freundii2343105442337600 (0)4 (1.3)4 (0.7)
Klebsiella oxytoca2274006270000 (0)0 (0)0 (0)
Enterobacter aerogenes1942604541112230 (0)0 (0)0 (0)
Proteus mirabilis1762944701450 (0)0 (0)0 (0)
Morganella morganii1662684344261 (0.6)0 (0)1 (0.2)
Proteus vulgaris97811780000 (0)0 (0)0 (0)
Providencia rettgeri45821275163 (6.7)0 (0)3 (2.4)
Total7,55312,20019,75339136675751 (0.7)45 (0.4)96 (0.5)
  • a First study period, October 2000 to March 2001.

  • b Second study period, November 2001 to April 2002.

  • c Percentages were calculated as follows: no. of MBL-producing isolates/no. of isolates collected × 100%.