Isolation and Identification of Staphylococcus aureus from Milk and Milk Products, Associated Factors for Contamination, and Their Antibiogram in Holeta, Central Ethiopia

Table 7

Antimicrobial resistance profiles of S. aureus from milk and milk products (n = 40).

Classes of antimicrobial agents	Antimicrobials	Disc conc. (μg)	Susceptible	Intermediate	Resistance
			No. (%)	No. (%)	No. (%)
Glycopeptides	Vancomycin	30	28 (70.00)	8 (20.00)	4 (10.00)
Tetracyclines	Tetracycline	30	27 (67.50)	—	13 (32.50)
Phenicols	Chloramphenicol	30	37 (92.50)	—	3 (7.50)
Quinolones	Nalidixic acid	30	10 (25.00)	15 (37.50)	15 (37.50)
Fluoroquinolones	Norfloxacin	10	37 (92.50)	—	3 (7.50)
Nitrofurantoin	Nitrofurantoin	300	36 (90.00)	2 (5.00)	2 (5.00)
Aminoglycosides	Gentamycin	10	34 (85.00)	—	6 (15.00)
Cephems	Cefotaxime	30	4 (10.00)	4 (10.00)	32 (80.00)
Penicillin	Ampicillin	10	2 (5.00)	—	38 (95.00)
	Oxacillin	1	5 (12.50)	—	35 (87.50)
	Amoxicillin	2	2 (5.00)	—	38 (95.00)
Macrolides	Azithromycin	15	38 (95.00)	—	2 (5.00)