Cloacael Carriage and Multidrug Resistance Escherichia coli O157:H7 from Poultry Farms, Eastern Ethiopia

Table 1

Zone diameter interpretive standard chart for Enterobacteriaceae [11].

Antimicrobial agents and symbols	Disc potency (µg)	Zone diameter, nearest whole mm
		Resistance	Intermediate	Susceptible
Amoxicillin (AML)	20	≤13	14–16	≥17
Ampicillin (AMP)	10	≤13	14–16	≥17
Cefoxitin (FOX)	30	≤14	15–17	≥18
Chloramphenicol (C)	30	≤12	13–17	≥18
Ciprofloxacin (CIP)	5	≤14	15–17	≥21
Clindamycin (CLI)	30	≤16	—	≥17
Erythromycin (E)	15	≤13	14–22	≥18
Gentamycin (CN)	10	≤12	13-14	≥15
Kanamycin (K)	30	≤13	14–17	≥18
Nalidixic acid (NAL)	30	≤17	—	≥18
Spectinomycin (SPT)	30	≤11	12–14	≥15
Streptomycin (S)	10	≤11	12–14	≥15
Tetracycline (TE)	30	≤11	12–14	≥15
Trimethoprim (TRI)	5	≤13	14–17	≥17