TABLE 5.
Distribution of amoxicillin-clavulanate resistance mechanisms in 225 E. coli isolates by year
| Mechanisma | No. (%) of E. coli isolates
|
|||
|---|---|---|---|---|
| 1996 | 1997 | 1998 | Total | |
| CASE (± TEM) | 38 (48) | 30 (38.4) | 27 (39.7) | 95 (42.2) |
| TEM | 12 (15) | 17 (21.8) | 7 (10.3) | 36 (16) |
| OXA-1 | 3 (3.8) | 1 (1.3) | 5 (7.3) | 9 (4) |
| IRT (± TEM) | 24 (30.4) | 29 (37.2) | 28 (41.2) | 81 (36) |
| CASE + IRT | 2 (2.5) | 1 (1.3) | 0 | 3 (1.3) |
| OXA-1 + IRT | 0 | 0 | 1 (1.5) | 1 (0.4) |
| Total | 79 (100) | 78 (100) | 68 (100) | 225 (100) |
a
CASE, cephalosporinase; OXA-1, oxacillinase-1.