TABLE 1

Results of the colorimetric assays from spiked blood culture

β-Lactamase class and identification (no. of isolates)Bacterial species identification (no. of isolates)aBlood culture (no. of isolates positive/total no. of isolates [%])
CNPt-DirectBlue-Carba
Class A carbapenemases
    KPC (19)Klebsiella pneumoniae (13P), Enterobacter cloacae complex (1P), Enterobacter aerogenes (1P), Escherichia coli (1P + 1N), Morganella morganii (1P + 1N)17/19 (89)17/19 (89)
    GES (6)Klebsiella pneumoniae (1P), Providencia rettgeri (1P), Kluyvera intermedia (2P + 2N)4/6 (66)4/6 (66)
Class B carbapenemases
    NDM (17)Klebsiella oxytoca (1P), Klebsiella pneumoniae (2P), Enterobacter cloacae complex (7P), Enterobacter sp. (2P), Escherichia coli (2P), Morganella morganii (2P), Citrobacter freundii (1P)17/17 (100)17/17 (100)
    IMP (4)Klebsiella pneumoniae (3P), Enterobacter cloacae complex (1P)4/4 (100)4/4 (100)
Class D carbapenemase
    OXA-48-like (11)Klebsiella pneumoniae (1P), Enterobacter cloacae complex (4P + 4N), Escherichia coli (2P)7/11 (64)7/11 (64)
Carbapenemase coproducer
    OXA-48-like + NDM (4)Enterobacter cloacae complex (4P)4/4 (100)4/4 (100)
  • a No. of isolates from a species that presented positive or negative results in the test is given. P, positive; N, negative.