Table 1.

Antimicrobial resistance criteria for inhibitory results against six antibiotics

Drug sensitivity test paper	Drug content of paper (μg/tablet)	Judgment standard of inhibition zone diameter (mm)
		R	I	S
Cephalexin	30	≤14	15‒17	≥18
Tetracycline	30	≤14	15‒18	≥19
Erythromycin	15	≤13	14‒22	≥23
Vancomycin	30	≤11	12‒14	≥15
Streptomycin	10	≤11	12‒14	≥15
Gentamicin	10	≤12	13‒14	≥15

R: resistant to antibiotics; I: moderately sensitive to antibiotics; S: sensitive to antibiotics.