Table 1.
Characterization of ESBL-producing strains.
| ESBL | IEF (pI) | Microorganism (number of isolates) | Conjugation (% positive) | Resistance phenotype (% nonsusceptible: I + R) | ERIC types patterns* | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| β-Lactams | Non-β-lactams | |||||||||
| CEP | FOX | CARB | CIP | GEN | SXT | |||||
| TEM-4 | 5.9 |
E. coli (2) K. pneumoniae (1) |
100 100 |
100 100 |
50 0 |
0 0 |
100 100 |
50 100 |
100 0 |
A L |
| TEM-10 | 6.0 | E. coli (8) | 87.5 | 100 | 25 | 0 | 87.5 | 0 | 75 | B, D, H |
| TEM-24 | 6.5 |
E. coli (12) K. pneumoniae (11) K. oxytoca (1) E. aerogenes (1) |
83.3 81.8 100 100 |
100 100 100 100 |
50 20 100 0 |
0 0 0 0 |
75 72.7 100 0 |
8.3 50 0 100 |
8.3 63.6 100 100 |
C, G, H, I K, L, O n.a. n.a. |
| TEM-52 | 6.0 |
E. coli (27) K. pneumoniae (12) |
81.4 100 |
100 100 |
36.4 8.4 |
0 0 |
84.6 91.6 |
53.8 83.3 |
42.3 33.3 |
A, B, E, F, J N, O |
| TEM-116 | 5.4 | E. coli (n = 4) | 100 | 100 | 50 | 0 | 75 | 75 | 0 | F |
| SHV-2 | 7.6 |
K. pneumoniae (3) E. coli (1) |
100 100 |
33.3 0 |
33.3 0 |
0 0 |
66.7 100 |
66.7 100 |
100 100 |
L A |
| SHV-5 | 8.2 |
K. pneumoniae (11) E. coli (6) |
72.7 83.3 |
100 100 |
27.3 66.7 |
0 0 |
63.6 100 |
72.7 100 |
27.3 0 |
L, N |
| SHV-12 | 8.2 |
K. pneumoniae (18) E. coli (6) |
83.3 100 |
100 100 |
27.7 33.3 |
0 0 |
61.1 100 |
94.4 100 |
77.8 66.7 |
K, M, N, O C, D, E |
| CTX-M-1 | 6.3 | E. coli (1) | 100 | 100 | 25 | 0 | 100 | 100 | 0 | E |
| CTX-M-3 | 8.4 | C. freundii (1) | 0 | 100 | 0 | 0 | 0 | 100 | 0 | n.a. |
| CTX-M-9 | 8.1 | E. coli (26) | 92.3 | 100 | 26.9 | 0 | 96.2 | 84.6 | 3.8 | A, C, D, G, I, J |
| CTX-M-14 | 8.1 | E. coli (16) | 68.8 | 100 | 12.5 | 0 | 100 | 75 | 0 | D, F, H, J |
| CTX-M-15 | 8.6 |
E. coli (21) K. pneumoniae (3) |
85.7 100 |
100 100 |
38.1 100 |
0 0 |
100 100 |
90.5 100 |
14.3 100 |
A, C, E, I, J N |
| CTX-M-32 | 9.0 | E. coli (1) | 100 | 100 | 0 | 0 | 100 | 100 | 0 | D |
ESBL: extended-spectrum β-lactamase; IEF: isoelectric focusing; pI: isoelectric point; I: intermediate; R: resistant; n.a.: not applicable. Antimicrobials: CEP: cefepime; FOX: cefoxitin; CARB: carbapenems (imipenem and meropenem); CIP: ciprofloxacin; Gen: gentamicin; SXT: combination of trimethoprim and sulfamethoxazole.
*Supplementary Material.