Table 4.

Antibiotic susceptibility of E. coli O157 and O157:H7 isolates.

S. No.	Antibiotics (μg/disk)	Representative E. coli isolates
		O157	O157:H7
1.	Penicillin G (30)	R	R
2.	Kanamycin (30)	S	S
3.	Piperacillin (100)	R	R
4.	Amikacin (30)	S	S
5.	Gentamycin (10)	S	S
6.	Cefotaxime (30)	I	I
7.	Streptomycin (10)	S	S
8.	Chloramphenicol (30)	S	S
9.	Tetracycline (30)	R	S
10.	Cotrimoxazole (25)	R	S
11.	Azithromycin (15)	S	S
12.	Nalidixic acid (30)	S	S
13.	Ampicillin (10)	R	R
14.	Nitrofurantoin (300)	R	R

S=Sensitive, I=Intermediate, and R=Resistant as per the standard guidelines of the Clinical and Laboratory Standards Institute. E. coli=Escherichia coli