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Table 1 Types of zones of inhibition around CTX determined by KBDA.

From: Kirby-Bauer disc approximation to detect inducible third-generation cephalosporin resistance in Enterobacteriaceae

KBDA zone types around CTX No. organisms (n = 95) Percentage of the zone type Susceptibility interpretation
S-type 15 16% Susceptible 24%
Sl-type 8 8%  
C-type 23 24% Resistant (Inducible) 76%
D-type 49 52%