Table 2. Standard inhibition zone diameter and percentage of susceptibility of 7 Nocardia spp. isolates to selected antimicrobials in disk-diffusion test. UNESP, Botucatu, SP, Brazil.

Antimicrobial	Zone diameter (mm)a			% Susceptible
	R	I	S
Amikacin	≤14	15-16	≥17	100
Amoxicillin/ clavulanate	≤13	14-17	≤13	100
Ampicillin	≤13	14-16	≥17	29
Cephalexin	≤14	15-17	≥18	100
Cephalonium	≤14	15-17	≥18	100
Cefoperazone	≤15	16-20	≥21	43
Ceftiofur	≤17	18-20	≥21	100
Ceftriaxone	≤13	14-20	≥21	86
Cefuroxime	≤14	15-17	≥18	72
Imipenem	≤13	14-15	≥16	72
Gentamicin	≤10	11-14	≥15	57
Mynocicline	≤14	15-19	≥19	100
Sulfamethoxazole/ trimethoprim	≤10	11-15	≥16	43

^aZone of inhibition diameter (mm) by disk diffusion method susceptibility inter­pretative guidelines based on NCCLS (2006), AMBAYE et al. (1997), and BAUER et al. (1966). R = resistant, I = intermediate, S = susceptible.