Volume 11, Number 1—January 2005
Research
Genetic Background of Escherichia coli and Extended-spectrum β-Lactamase Type
Table 3
Distribution of extended-spectrum β-lactamase types among Escherichia coli strains isolated from infection or colonization, according to phylogenetic group
| Phylogenetic group | No. strains in the group (%) | No. (%) of isolates producing |
||
|---|---|---|---|---|
| TEM | SHV | CTX-M | ||
| Infection | ||||
| A0 | 5 (5.8) | 2 (6.4) | 1 (5.8) | 2 (5.2) |
| A1 | 18 (20.9) | 11 (35) | 0 | 7 (18.4) |
| B1 | 9 (10.4) | 2 (6.4) | 3 (17.6) | 4 (10.5) |
| B22 | 7 (8.1) | 5 (16) | 1 (5.8) | 1 (2.6) |
| B23 | 28 (32.5) | 8 (25.8) | 10 (58.8) | 10 (26.3) |
| D1 | 11 (12.7) | 3 (9.6) | 2 (11.7) | 6 (15.7) |
| D2 | 8 (9.3) | 0 | 0 | 8 (21) |
| All groups | 86 (100) | 31 (100) | 17 (100) | 38 (100) |
| Colonization | ||||
| A0 | 7 (16.2) | 5 (20.8) | 0 | 2 (14.2) |
| A1 | 6 (13.9) | 2 (8.3) | 0 | 4 (28) |
| B1 | 4 (9.3) | 3 (12.5) | 0 | 1 (7.1) |
| B22 | 4 (9.3) | 2 (8.3) | 1 (20) | 1 (7.1) |
| B23 | 8 (18.6) | 5 (20.8) | 3 (60) | 0 |
| D1 | 11(25.5) | 6 (25) | 1 (20) | 4 (28.4) |
| D2 | 3 (6.9) | 1 (4.1) | 0 | 2 (14.1) |
| All groups | 43 (100) | 24 (100) | 5 (100) | 14 (100) |
| All strains | ||||
| A0 | 12 (9.3) | 7 (12.7) | 1 (4.5) | 4 (7.6) |
| A1 | 24 (18.6) | 13 (23.6) | 0 | 11 (21.1) |
| B1 | 13 (10) | 5 (9) | 3 (13.6) | 5 (9.6) |
| B22 | 11 (8.5) | 7 (12.7) | 2 (9) | 2 (3.8) |
| B23 | 36 (27.9) | 13 (23.6) | 13 (59) | 10 (19.2) |
| D1 | 22 (17) | 9 (16.3) | 3 (13.6) | 10 (19.2) |
| D2 | 11 (8.5) | 1 (1.8) | 0 | 10 (19.2) |
| All groups | 129 (100) | 55 (100) | 22 (100) | 52 (100) |
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