Table 1

Results of the Carba NP test II on carbapenemase-producing strains

Ambler classStrainnaCarbapenemase(s)Carba NP test IIb
No antibioticIMP + Zn2+IMP + Zn2+ + TZBIMP + EDTA
AE. coli4KPC-2++
K. pneumoniae4KPC-2++
1KPC-3++
E. cloacae5KPC-2++
C. freundii1KPC-2++
S. marcescens2KPC-2++
P. aeruginosa3KPC-2++
S. marscescens1Sme-1++
1Sme-2++
BE. coli1VIM-1++
2VIM-4++
1VIM-19++
K. pneumoniae3VIM-1++
3VIM-4++
1VIM-19++
E. cloacae1VIM-1++
1VIM-4++
C. freundii2VIM-2++
P. aeruginosa3VIM-2++
2VIM-4++
E. coli2IMP-1++
1IMP-8++
K. pneumoniae4IMP-1++
2IMP-8++
E. cloacae3IMP-1++
2IMP-8++
S. marcescens1IMP-1++
1IMP-11++
P. aeruginosa2IMP-1++
1IMP-2++
1IMP-13++
E. coli5NDM-1++
2NDM-4++
K. pneumoniae8NDM-1++
P. stuartii1NDM-1++
P. rettgeri1NDM-1++
Salmonella spp.1NDM-1++
C. freundii1NDM-1 + VIM-4 + OXA-181+++
P. aeruginosa2NDM-1++
E. asburiae1IMI-2++
P. aeruginosa1SPM-1++
P. aeruginosa3AIM-1++
E. cloacae2GIM-1++
P. aeruginosa4GIM-1++
DE. coli6OXA-48+++
K. pneumoniae10OXA-48+++
E. cloacae3OXA-48+++
C. koseri1OXA-48+++
K. pneumoniae1OXA-181+++
P. rettgeri1OXA-181+++
  • a n, number of isolates tested.

  • b −, red (unchanged color); +, yellow-orange; IMP, imipenem; TZB, tazobactam.