TABLE 3.

Isolation frequencies of metallo-β-lactamase-producing isolates in 13 laboratories

Laboratory code (type)No. of isolates collectedNo. (%) of MBL-producing isolatesc
2000a2001bTotal2000a2001bTotal
A (university hospital)1,2931,5712,8647 (0.5)3 (0.2)10 (0.4)
B (university hospital)9511,2812,2325 (0.5)11 (0.9)16 (0.7)
C (university hospital)1,1391,0032,14231 (2.7)24 (2.4)55 (2.6)
D (university hospital)9658731,8380 (0)1 (0.1)1 (0.1)
E (university hospital)8837281,6110 (0)0 (0)0 (0)
F (general hospital)4826271,1090 (0)2 (0.3)2 (0.2)
G (general hospital)4634539160 (0)0 (0)0 (0)
H (general hospital)3474217681 (0.3)2 (0.5)3 (0.4)
I (general hospital)3042805841 (0.3)0 (0)1 (0.2)
J (general hospital)2552515064 (1.5)2 (0.8)6 (1.2)
K (general hospital)2122935052 (0.9)0 (0)2 (0.4)
L (general hospital)2591524110 (0)0 (0)0 (0)
M (commercial laboratory)NDd42674267NDd0 (0)0 (0)
  • a First study period, October 2000 to March 2001.

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

  • c Percentages are no. of MBL-producing isolates/no. of isolates collected × 100.

  • d ND, not determined.