Table 1: Comparison of resistance of H. pylori primary and secondary strains to clarithromycin and levofloxacin in 2009–2011.

Antimicrobial agentNo. (%) of resistant H. pylori strains in the
years 2009–2011
All strainsPrimary strainsSecondary strains

CLA(1)11 (22%)8 (19%)3 (38%)
LEV(1)8 (16%)5 (12%)3 (38%)

(1)CLA: clarithromycin, LEV: levofloxacin.