Table 3.

β-Lactam MICs for IRT-producingP. mirabilis strains

β-LactamMIC (μg/ml) for the following strains (enzymes):
CF739 (TEM-73 [IRT-18])CF749 (TEM-74 [IRT-19])CF449 (TEM-44 [IRT-13])CF659 (TEM-65 [IRT-16])
Amoxicillin1,0242,0481,02464
Amoxicillin + CAa 1,02451251264
Ticarcillin832161
Ticarcillin + CA4421
Piperacillin161682
Piperacillin + TAZb 410.50.5
Cephalothin2442
  • a CA, clavulanic acid (2 μg/ml).

  • b TAZ, tazobactam (4 μg/ml).