Isolation and Characterization of Gram-Negative Bacterial Species from Pasteurized Dairy Products: Potential Risk to Consumer Health

Table 4

Antibiotic disk diffusion sensitivity test results.

Isolate	Antibiotic
	E	Tet	G	Chl	Cip	N	Amp	A/C	TMS	Cef
E. coli^®	R	S	S^#	R	S	S	R		S	I
S. aureus^®®	R	S	S^#	S	S	S	R	S	S	I
1	R	S	R	S	I	S	R	ND	ND	ND
3	R	R^•	S^#	R^•	R	S	R^•	S	S	R
4	R	ND	ND	ND	ND	ND	ND	ND	S	R
5	R	S	R	S	I	S	R	R	S	I
6	R	S	S^#	S	I	S	R	R	R	R
7	R	S	I	S	I	S	R	R	S	I
9	R	S	S^#	S	I	S	R	ND	ND	ND
12	R	S	I	S	I	S	R	I	S	S
14^♦	R	S	R	S	I	S	R	R	I	R
15	R	S	S^#	S	I	S	R	I	S	R
20	R	S	I	S	I	S	R	ND	ND	ND
24	R	S	S^#	S	I	S	R	ND	ND	ND

E: erythromycin, Tet: tetracycline, G: gentamycin, Chl: chloramphenicol, Cip: ciprofloxacin, N: nitrofurantoin, Amp: ampicillin, A/C: amoxicillin/clavulanate, TMS: trimethoprim-sulfamethoxazole, Cef: ceftriaxone, ND: not determined, R: resistant, S: susceptible, and I: intermediate. Inhibition zone diameters were measured in millimeters. ^®(ATCC 25922); ^®®(ATCC 25923). ^♦Isolate 14 is from the same source as isolate 1. ^•Highly resistant, no inhibition zone (0.00 mm). ^#The CLSI guideline states in vitro activity does not correlate with in vivo activity.