Table 2.
Genotypic and phenotypic β-lactamase results from 31 selected isolates
| Isolate no. | Species | Genotype* | Phoenix ESBL† | DD‡ | |||
|---|---|---|---|---|---|---|---|
| ESBL | AmpC | KPC | ESBL | AmpC | |||
| A10 | E. coli | − | − | − | + | − | + |
| A13 | E. coli | − | − | − | + | − | − |
| A15 | E. coli | − | + | − | + | − | + |
| D2 | K. pneumoniae | − | − | − | + | + | + |
| E6 | E. coli | CTX-M | − | − | + | + | − |
| F1 | K. pneumoniae | − | + | − | − | − | + |
| F4 | E. coli | − | + | − | − | − | + |
| F6 | E. coli | CTX-M | − | − | − | + | − |
| F9 | K. pneumoniae | SHV-28, CTX-M | − | − | + | + | − |
| G7 | K. pneumoniae | − | − | − | + | − | − |
| H2 | K. pneumoniae | SHV-12 | + | − | − | + | + |
| J9 | K. pneumoniae | SHV-12 | + | − | − | + | + |
| J10 | K. pneumoniae | SHV-12 | − | − | − | + | − |
| 101 | K. pneumoniae | − | − | + | + | +§ | + |
| 104 | E. coli | − | − | − | + | − | − |
| 109 | E. coli | − | − | − | + | − | − |
| 113 | E. coli | − | − | − | + | − | + |
| 116 | E. coli | − | − | − | + | − | − |
| 118 | K. pneumoniae | − | − | + | + | + | + |
| 119 | K. pneumoniae | SHV-12 | − | − | + | + | − |
| 124 | K. pneumoniae | − | − | − | + | − | − |
| 126 | E. coli | CTX-M | − | − | + | + | + |
| 140 | E. coli | CTX-M | − | − | + | + | − |
| 141 | E. coli | − | − | − | + | − | − |
| 144 | E. coli | − | − | − | + | − | + |
| 146 | E. coli | − | − | − | + | − | − |
| 147 | K. pneumoniae | CTX-M | − | − | + | − | − |
| 154 | K. pneumoniae | − | − | − | + | − | − |
| 166 | K. pneumoniae | − | − | − | + | − | − |
| 169 | K. pneumoniae | − | − | − | + | − | − |
| 2-9 | E. coli | − | + | − | − | − | + |
*TEM, SHV and KPC PCR products were sequenced to identify bla subtypes. Both KPC+ isolates were type 3 based on sequence analysis.
†ESBL results determined using the Phoenix system.
‡Phenotypes were determined by DD testing as described in the text.
§This isolate was determined as ESBL only using ceftazidime+BA±CA.