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Table 1 Frequency of carbapenemase producing among Gram-negative bacilli by phenotypic tests

From: Detection and characterization of carbapenem resistant Gram‐negative bacilli isolates recovered from hospitalized patients at Soba University Hospital, Sudan

  Positive isolates for a particular phenotypic test Total
Bacterial isolates EDTA MHT + BA EDTA + BA EDTA + AB + MHT  
  n (%) n (%) n (%) n (%) n (%)
E.coli (n = 28) 17 (16.4) 2 (8.3) 3 (11.1) 4 (26.6) 26 (15.2)
Klebsiella spp. (n = 82) 41 (39) 10 (41.6) 12 (44.4) 8 (53.3) 71 (41.5)
Pseudomonas spp. (n = 45) 19 (18) 9 (37.5)a 4 (14.9) 1 (6.6) 33(19.2)
Acin. baumannii (n = 36) 19 (18) 3 (12.6) a 6 (22.2) 2 (13.3) 30 (17.6)
Burkholderia cepacia (n = 2) 2 (1.9) 0 (0) 0 (0) 0 (0) 2 (1.2)
Enterobacter spp. (2) 2 (1.9) 0 (0) 0 (0) 0 (0) 2 (1.2)
Other GNBb (n = 11) 5 (4.8) 0 (0) 2 (7.4) 0(0) 7 (4)
Total (n = 206) 105(50.9) 24 (11.7) 27 (13.1) 15 (7.2) 171(83)
  1. -MHT positive = KPC + OXA48 - Boronic acid positive = KPC
  2. -MHT + Boronic acid positive = KPC -MHT positive + boronic acid negative = OXA 48
  3. Note: MHT applied only for Enterobacterceae. -EDTA positive = Metallo-β-lactamase.aThese isolates just positive by BA and not MHT.bOther Gram-negative bacilli include: Citrobacter species (3), Serratia species (1), Proteus spp. (2), Stenotrophomonas maltophilia (3), Vibrio vurneficus (1) and Morganella morganii (1).