Antimicrobial Resistance Phenotype of Staphylococcus aureus and Escherichia coli Isolates Obtained from Meat in the Formal and Informal Sectors in South Africa

Table 5

Percentage antibiotic susceptibility of E. coli isolates in the formal () and informal () meat sectors.

Antimicrobial class	Antimicrobials	Disc code	Potency (μg)	Meat sector
				Formal		Informal
				R (%)	S (%)	R (%)	S (%)
Quinolones	Ciprofloxacin	CIP	5	28 (20)	112 (80)	28 (26.9)	76 (73.1)
	Norfloxacin	NOR	10	20 (14.3)	120 (85.7)	17 (16.3)	87 (83.7)
Beta-lactams	Amoxicillin	A	25	82 (58.6)	58 (41.4)	89 (85.6)	15 (14.4)
	Ampicillin	AMP	25	44 (31.4)	96 (68.6)	69 (66.3)	35 (33.7)
Tetracyclines	Tetracycline	T	30	115 (82.1)	25 (17.9)	96 (92.3)	8 (7.7)
Aminoglycosides	Streptomycin	S	300	109 (77.9)	31 (22.1)	70 (67.3)	34 (32.7)
	Kanamycin	K	30	91 (65)	49 (35)	32 (30.8)	72 (69.2)
Cephalosporins	Ceftriaxone	CRO	30	20 (14.3)	120 (85.7)	40 (38.5)	64 (61.5)
	Ceftazidime	CAZ	10	37 (26.4)	103 (73.6)	29 (27.9)	75 (72.1)
Carbapenems	Imipenem	IMI	10	0 (0)	140 (100)	43 (41.3)	61 (58.7)
	Ertapenem	ETP	10	2 (1.4)	138 (98.6)	19 (18.3)	85 (81.7)
Phenicols	Chloramphenicol	C	30	127 (90.7)	13 (9.3)	77 (74)	27 (26)
Foliate pathway inhibitor	Sulfamethoxazole/trimethoprim	TS	25	93 (66.4)	47 (33.6)	91 (87.5)	13 (12.5)

S: susceptible; R: resistance.