TABLE 3

Performance of the assays stratified by carbapenemase variant

CarbapenemaseNo. of isolatesa
β-CarbabcCarba NPNeoRapid CARBbcCIM
PNPNPNPN
Ambler class D (n = 34)
    OXA-48 (n = 25)25252525
    OXA-162 (n = 2)2222
    OXA-181 (n = 2)2222
    OXA-204 (n = 1)1111
    OXA-232 (n = 2)2222
    OXA-244 (n = 2)211112
    Total (n [%])34 (100)33 (97.1)1 (2.9)33 (97.1)1 (2.9)34 (100)
Ambler class A (n = 18)
    KPC-2 (n = 17)17171717
    KPC-3 (n = 1)1111
    Total (n [%])18 (100)18 (100)18 (100)18 (100)
Ambler class B (n = 50)
    NDM-1 (n = 19)19191919
    NDM-7 (n = 1)1111
    VIM-1 (n = 18)18181818
    VIM-2 (n = 3)3333
    VIM-4 (n = 2)2222
    VIM-27 (n = 1)1111
    VIM-39 (n = 1)1111
    GIM-1 (n = 5)5555
    Total (n [%])50 (100)50 (100)50 (100)50 (100)
OXA-48 plus NDM-1 (n = 2)2222
    Total (n [%])2 (100)2 (100)2 (100)2 (100)
Total carbapenemase positive (n [%])104 (100)103 (99.0)1 (1.0)103 (99.0)1 (1.0)104 (100)
No carbapenemases (n = 81)
    Total carbapenemase negative (n [%])4 (4.9)77 (95.1)4 (4.9)77 (95.1)7 (8.6)74 (91.4)81 (100)
  • a P, positive result; N, negative result.