Table 4.

MICs by Etest of seven antimicrobial agents for M. fortuitum group reported by four separate laboratories

DrugMIC (μg/ml) for isolate:
1351135213531359
Mode (range)% AgreementaMode (range)% AgreementaMode (range)% AgreementaMode (range)% Agreementa
Amikacin2 (1–2)1001 (1–4)94.41 (1)1001 (1)100
Cefoxitin64 (8–512)80.5512 (128–512)94.416 (8–16)10032 (2–512)86.1
Ciprofloxacin0.125 (0.125)1000.125 (0.125)1000.125 (0.125)1001 (0.25–2)88.9
Clarithromycin128 (0.125–128)75.016 (2–128)80.50.125 (0.03–0.5)69.41 (0.03–2)77.8
Doxycycline64 (32–64)10064 (32–64)1000.25 (0.25–0.5)1000.25 (0.25–0.5)100
Imipenem64 (1–64)80.564 (4–64)66.764 (2–64)50.064 (1–64)41.7
Trimethoprim-sulfamethoxazole1 (1–64)75.01 (1)1001 (1)1001 (1)100
  • a Percent MICs in each 3-dilution range (mode ± log2).