Antimicrobial Susceptibility of Escherichia coli Isolated from Fresh-Marketed Nile Tilapia (Oreochromis niloticus)

Table 1

Number of susceptible, intermediate, and resistant strains of Escherichia coli isolated from the gills, muscle, and body surface of farmed Nile tilapias (Oreochromis niloticus) fresh-marketed in supermarkets in Fortaleza (Ceará, Brazil), 2012.

Tissue sampled	Antimicrobial agents tested
	AMI	AMP	ATM	CET	CTX	CIP	GEN	IMP	NAL	SUT	TC
Gills
S	15	12	15	11	15	15	15	15	14	14	11
I	0	1	0	4	0	0	0	0	1	0	0
R	0	2	0	0	0	0	0	0	0	1	4
Body surface
S	25	20	25	23	25	25	25	25	24	24	21
I	0	2	0	2	0	0	0	0	1	0	1
R	0	3	0	0	0	0	0	0	0	1	3
Muscle
S	4	4	4	4	4	4	4	4	4	4	4
I	0	0	0	0	0	0	0	0	0	0	0
R	0	0	0	0	0	0	0	0	0	0	0

S: susceptible; I: intermediate; R: resistant.
AMI: amikacin; GEN: gentamicin; IMP: imipenem; CET: cephalothin; CTX: cefotaxime; CIP: ciprofloxacin; ATM: aztreonam; AMP: ampicillin; NAL: nalidixic acid; SUT: sulfametoxazol-trimetoprim; TC: tetracycline.