Table 5.

Distribution of amoxicillin-clavulanate resistance mechanisms in 225 E. coli isolates by year

MechanismaNo. (%) ofE. coli isolates
199619971998Total
CASE (± TEM)38 (48)30 (38.4)27 (39.7)95 (42.2)
TEM12 (15)17 (21.8)7 (10.3)36 (16)
OXA-13 (3.8)1 (1.3)5 (7.3)9 (4)
IRT (± TEM)24 (30.4)29 (37.2)28 (41.2)81 (36)
CASE + IRT2 (2.5)1 (1.3)03 (1.3)
OXA-1 + IRT001 (1.5)1 (0.4)
Total79 (100)78 (100)68 (100)225 (100)
  • a CASE, cephalosporinase; OXA-1, oxacillinase-1.