Serotyping, antibiogram, and detection of bacterial pathogens associated with bovine respiratory disease in selected areas of Ethiopia

Table 4 Antimicrobial susceptibility assay of the major bacterial pathogens of BRD

Class	Antimicrobials	Disc conc.	Standard breakpoints	Susceptibility percentage of isolates (%)
Class	Antimicrobials	Disc conc.	Standard breakpoints	M. H	P.M	H.S
β-lactam	Penicillin-G	10 U	R ≤ 28; S ≥ 29^a	56.8	51.9	48.2
β-lactam	Ampicillin	10 μg	R < 17; S ≥ 17^b	61.3	56.7	57.1
Fluoroquinolones	Enrofloxacin	5 μg	R ≤ 16; S ≥ 21^a	100	100	100
Fluoroquinolones	Ciprofloxacin	5 μg	R < 27; S ≥ 27^b	100	100	100
Aminoglycosides	Streptomycin	100 μg	R ≤ 11; S ≥ 15^a	21.5	16.0	28.6
Aminoglycosides	Gentamycin	10 μg	R ≤ 12; S ≥ 15^a	27.2	19.8	33.9
Tetracycline	Tetracycline	30 μg	R < 24; S ≥ 24^b	81.7	77.8	87.5
Tetracycline	Oxytetracycline	30 μg	R ≤ 14; S ≥ 19^a	85.3	83.9	91.1
	Sulfamethoxazole-trimethoprim	25 μg	R ≤ 10; S ≥ 16^a	100	100	100
Phenicols	Florfenicol	30 μg	R ≤ 14; S ≥ 19^a	100	100	100
Cephalosporin	Ceftiofur	30 μg	R ≤ 17; S ≥ 21^a	100	100	100

ISSN: 2046-0481