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Table 6 Yearly variation of main resistance phenotypes

From: Resistance trends in gram-negative bacteria: surveillance results from two Mexican hospitals, 2005–2010

Resistance phenotype

Year of isolation (Total/Percentage)

2005

2006

2007

2008

2009

2010

E. coli ESBL phenotypea,f

36 (35.0)

26(37.7)

29(38.7)

42(40.0)

45(54.2)

67(52.4)

Klebsiella spp. ESBL phenotypea

37(40.5)

17(33.3)

27(41.5)

7.8(20.0)

15(36.6)

21(43.8)

Imipenem-NSKlebsiellab

7(8.1)

2(2.0)

3(4.6)

0.00

2(4.9)

1(2.1)

Ceztazidime-R Enterobacterc

16(32.7)

6(16.7)

14(34.1)

10(37.0)

17(47.2)

13(46.4)

Imipenem-NS – Enterobacterd

1(2.0)

0.00

2(4.5)

4(14.8)

2(5.6)

1(3.6)

Imipenem-R Acinetobactere,f

4(13.8)

3(8.8)

6(20.0)

40(48.9)

33(65.6)

54(63.5)

Imipenem-R P. aeruginosae

13(16.8)

26(32.1)

13(27.1)

21(27.3)

13(25.0)

16(22.1)

  1. a Defined as MIC ≥2 μg/ml for ceftazidime or ceftriaxone or aztreonam [CLSI, 2011].
  2. b Imipenem MIC of ≥2 μg/ml [CLSI, 2011].
  3. c Ceftazidime MIC of ≥16 μg/ml [CLSI, 2011].
  4. d Imipenem MIC of ≥2 μg/ml [CLSI, 2011].
  5. e Imipenem MIC of ≥8 μg/ml [CLSI, 2011].
  6. f Resistance trend over time p<0.05.