TABLE 1.
Distribution of carbapenemase-producing organisms isolated from 6,868 rectal swabs using the direct MacConkey plate method
| Organism group or species | No. of organisms isolated | Carbapenemase (CP) gene(s) detectedb |
|---|---|---|
| CPE isolates (n = 108) | ||
| Citrobacter amalonaticus | 7 | blaKPC |
| 2 | blaKPC and blaNDM | |
| 1 | blaNDM | |
| 2 | No CP detected | |
| Citrobacter freundii | 1 | blaKPC |
| 2 | No CP detected (blaCMY-2) | |
| Enterobacter cloacae | 8 | blaKPC |
| 1 | blaKPC and blaOXA-48-like | |
| 26a | No CP detected (18 blaACT or blaMIR, 8 negative) | |
| Escherichia coli | 6 | blaKPC |
| 2 | No CP detected | |
| Hafnia alvei | 1 | blaNDM |
| Klebsiella (Enterobacter) aerogenes | 1 | blaKPC |
| Klebsiella pneumoniae | 26 | blaKPC |
| 13 | blaOXA-48-like and blaNDM | |
| 5 | blaNDM | |
| 1 | No CP detected | |
| Morganella morganii | 3 | No CP detected (1 blaACT or blaMIR, 1 blaDHA, and 1 negative) |
| CP-NF isolates (n = 105) | ||
| Acinetobacter baumannii complex | 12 | blaOXA-24 |
| 1 | blaOXA-23 | |
| 6 | No CP detected | |
| Acinetobacter radioresistans | 1 | blaOXA-23 |
| Pseudomonas aeruginosa | 3 | blaVIM |
| 7 | No CP detected | |
| Pseudomonas otitidis | 1 | No CP detected |
| Stenotrophomonas maltophilia | 74 | Not tested due to chromosomally encoded L1 metallo-β-lactamase |
a
A total of 14 isolates were indeterminate by the mCIM.
b
Where no CP genes were identified, other β-lactamase genes detected are listed in parentheses.