Research Article

Molecular Characterization of ESBL-Producing Enterobacteriaceae in Northern Portugal

Table 1

Characterization of ESBL-producing strains.

ESBLIEF (pI)Microorganism (number of isolates)Conjugation (% positive)Resistance phenotype (% nonsusceptible: I + R)ERIC types patterns*
β-LactamsNon-β-lactams
CEPFOXCARBCIPGENSXT

TEM-45.9E. coli (2)
K. pneumoniae (1)
100
100
100
100
50
0
0
0
100
100
50
100
100
0
A
L
TEM-106.0E. coli (8)87.5100250 87.5075B, D, H
TEM-246.5E. 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-526.0E. 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-1165.4E. coli ( )10010050075750F
SHV-27.6K. 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-58.2K. 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-128.2K. 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-16.3E. coli (1)1001002501001000E
CTX-M-38.4C. freundii (1)01000001000n.a.
CTX-M-98.1E. coli (26)92.310026.9096.284.63.8A, C, D, G, I, J
CTX-M-148.1E. coli (16)68.810012.50100750D, F, H, J
CTX-M-158.6E. 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-329.0E. coli (1)100100001001000D

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.