TABLE 2.

Antimicrobial susceptibility of Salmonella sp. isolates (n = 91) from chicken farms in South Korea

Antimicrobial agentMIC (μg/ml)Resistance (%)
RangeMIC50MIC90Breakpoint
Amoxicillin≤2->1,024≤21,02432a18.7
Ampicillin≤4->1,024≤451232a16.5
Apramycin2-644832c3.3
Ceftiofur≤0.25->640.518c2.2
Cephalothin≤1-2564832a4.4
Chloramphenicol2->2564832a5.5
Ciprofloxacin≤0.25-32≤0.25≤0.254a1.1
Enrofloxacin≤0.25-2≤0.2512b1.1
Florfenicol2->1284832c3.3
Gentamicin≤0.5-128≤0.518b4.4
Nalidixic acid2->256>256>25632a63.7
Neomycin≤1-256≤1216c5.5
Streptomycin≤1->2568>25632c38.5
Sulfamethoxazole8->1,024>1,024>1,024512a74.7
Tetracycline≤1->256225616a28.6
Trimethoprim≤1-256≤1≤116a4.4
  • a The value was a CLSI (M100-S19; 2009) breakpoint.

  • b The value was a CLSI (M31-A3; 2008) breakpoint.

  • c The Danish Integrated Antimicrobial Resistance Monitoring and Research Programme (DANMAP) Report, 2006.