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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.