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Comparative sensitivity of methods of phenotypic characterization of ESBL E. coli.
| Type of samples | CDDT method | DDST method | Ezy MIC strip |
|---|---|---|---|
| Positive samples | 135 | 115 | 84 |
| Negative samples | 0 | 20 | 51 |
| Total number of samples | 135 | 135 | 135 |
| Percent sensitivity | 100 | 85 | 62 |
| Chi-square value | 67.7** |
p<0.01 results are highly significant. ESBL=Extended spectrum beta-lactamase, E. coli=Escherichia coli, CDDT=Combined disc diffusion test, DDST=Double disc synergy test
