Table 1.

MIC values for β-lactams in the presence of 2.5 μg ml–1 clavulanic acid. The XDR strains were a subset of those previously reported (18).

Strainβ-lactamMIC value (μg ml-1)
Erdman Meropenem 0.5
H37Rv Amoxicillin >10
H37Rv Ampicillin 5.0
H37Rv Cefotaxime 1.25
H37Rv Cephalothin 0.94
H37Rv Imipenem 0.16
H37Rv Meropenem 0.32
XDR-1 Meropenem 0.94
XDR-2 Meropenem 0.625
XDR-3 Meropenem 0.625
XDR-4 Meropenem 0.625
XDR-5 Meropenem 0.625
XDR-6 Meropenem 0.625
XDR-7 Meropenem 0.625
XDR-8 Meropenem 0.94
XDR-9 Meropenem 1.25
XDR-10 Meropenem 0.47
XDR-11 Meropenem 0.23
XDR-12 Meropenem 0.625
XDR-13 Meropenem 0.32