TABLE 2

Carba NP test and Rapid CARB screen kit results for carbapenemase-negative Enterobacteriaceae and Pseudomonas aeruginosa collection strains (n = 69)

Group/species (no. of isolates)ESBLAmpCOther β-lactamase(s)Nonenzymatic resistance mechanism(s)Total no.No. with negative CNP result:No. with RCS result of:
PositiveaNegativeUninterpretable
Enterobacteriaceae (56)
    E. coliCTX-M group 1OXA-1111
CTX-M group 12211
CTX-M group 2666
CTX-M group 9111
SHV-2aACC-1111
TEM-10111
TEM-52111
ACC-1111
CMY-42111
CMY-60111
FOX-3111
CARB-7111
TEM-30111
    K. pneumoniaeCTX-M group 1OXA-9Decreased membrane permeability111
CTX-M group 1Decreased membrane permeability111
TEM-10Decreased membrane permeability111
TEM-52OXA-1Decreased membrane permeability111
DHA-1OXA-1Decreased membrane permeability111
CTX-M group 1OXA-1111
CTX-M group 1222
CTX-M group 2SHV-11111
CTX-M group 9SHV-76111
CMY-2111
DHA-1SHV-113321
LEN111
    K. oxytocaCTX-M group 1111
CTX-M group 2111
CTX-M group 9, SHV-12111
GES-7111
    E. cloacaeCTX-M group 1111
CTX-M group 2111
CTX-M group 9111
CTX-M group 9, SHV-12111
    Enterobacter aerogenesCTX-M group 9cAmpCb111
TEM-24, SHV-2a111
    Enterobacter kobeiCTX-M group 9, SHV-12111
    C. freundiiCTX-M group 1OXA-1111
GES-7111
    C. braakiiGES-7111
    Hafnia alveicAmpC222
    S. marcescensCTX-M group 1111
    Proteus mirabilisCTX-M group 2222
TEM-110111
TEM-2111
CMY-2111
Pseudomonas aeruginosa (13)BEL-1222
GES-1OprD deficient111
PER-1OXA-2, OXA-10OprD deficient + MexA/B-OprM111
PER-1OprD deficient111
PER-1111
VEB-1bOprD deficient + MexA/B-OprM111
VEB-1bOXA-10OprD deficient + MexA/B-OprM111
cAmpCOXA-10OprD deficient + MexA/B-OprM111
OXA-2111
OXA-20-like, OXA-18111
cAmpCOXA-9OprD deficient + MexA/B-OprM111
CARB111
  • a All results were weakly positive.

  • b cAmpC, overexpressed chromosomal cephalosporinase.