TABLE 3

C. coli susceptibility and consistencya

AntibioticNo. of isolates% consistentc% resistantPPVdNPV
SusceptiblebResistantb
Azithromycin26529100.0%9.9%0.7631
Ciprofloxacin20787100.0%29.6%11
Clindamycin24829 (17)94.2%15.6%NC0.844
Erythromycin26529100.0%9.9%0.7631
Florfenicol2940100.0%0.0%NC1
Gentamicin2886100.0%2.0%11
Nalidixic acid201 (3)87 (3)98.0%30.6%10.986
Telithromycin257 (16)2194.6%7.1%0.5531
Tetracycline80 (3)210 (1)98.6%71.8%0.9890.988
  • a Overall consistency was 96.7%, with a PPV of 0.904 and an NPV of 0.982.

  • b The number of isolates with genotypes consistent with either susceptibility or resistance to a given antibiotic is shown, with the number of isolates with genotypes inconsistent with either susceptibility or resistance to a given antibiotic displayed in parentheses. Values of zero in parentheses have been dropped for clarity.

  • c “% consistent” describes the percentage of isolates with a consistent phenotype. For macrolides and fluoroquinolones, consistency estimates include point mutation data.

  • d NC means the value cannot be calculated as there are no expected resistant isolates.