Susceptibility testing quality control studies with fosfomycin tromethamine

Multiple studies were performed to define the quality control ranges for susceptibility tests of fosfomycin tromethamine. For disk diffusion tests, the limits proposed are 22 to 30 mm forEscherichia coli ATCC 25922 and 25 to 33 mm forStaphylococcus aureus ATCC 25923. Broth microdilution tests were not reproducible. For agar dilution tests, ranges proposed are 0.5 to 2.0 g/ml forEscherichia coli ATCC 25922, 0.5 to 4.0 g/ml forStaphylococcus aureus ATCC 29213; 2.0 to 8.0 g/ml forPseudomonas aeruginosa ATCC 27853, and 32 to 128 g/ml forEnterococcus faecalis ATCC 29212.