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. 2016 Nov 16;9(11):1259–1263. doi: 10.14202/vetworld.2016.1259-1263

Table 4.

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