TABLE 1

Antimicrobial susceptibility test results for Helicobacter pylori isolates (n = 413)

AntibioticNo. (%) of isolates with an MIC (μg/ml) of:Total no. of isolates
≤0.06≤0.250.5>0.5≤11≤22>24≤88>8163264128256>256
Amoxicillin405 (98.8)1 (0.2)2 (0.5)2 (0.5)410
Ciprofloxacin190 (46.5)8 (2.0)211 (51.6)409
Clarithromycina114 (27.7) (S)8 (1.9) (I)290 (70.4) (R)412
Metronidazole58 (17.6)24 (7.3)66 (20.0)116 (35.2)63 (19.1)2 (0.6)1 (0.3)330
Tetracycline156 (38.1)246 (60.1)3 (0.7)4 (1.0)409
  • a Clinical and Laboratory Standards Institute interpretive criteria exist only for clarithromycin; S, susceptible; I, intermediate; R, resistant.