Molecular Characterization of Shiga Toxin-Producing Escherichia coli Isolated from Ruminant and Donkey Raw Milk Samples and Traditional Dairy Products in Iran

Table 6

Distribution of antibiotic resistance genes in various serotypes of E. coli isolated from raw animal milk samples and traditional dairy products in Iran.

STEC serotypes	Antibiotic resistance genes
	aadA1	tetA	tetB	dfrA1	qnr	aac(3)-IV	sul1	blaSHV	CITM	cat1	cmlA
O157 (14)	10	7	5	12	14	7	8	7	8	6	4
O26 (18)	13	11	4	5	5	8	11	10	9	3	8
O103 (6)	1	2	1	2	2	1	2	2	2	1	—
O111 (10)	3	3	2	7	12	1	4	6	4	4	1
O145 (2)	—	—	—	—	—	—	1	—	—	—	1
O45 (6)	1	1	—	6	1	—	1	3	5	1	—
O91 (2)	—	—	1	1	—	1	1	—	—	—	—
O113 (3)	—	1	—	1	—	1	1	1	1	—	1
O121 (3)	—	—	1	—	—	—	1	—	1	1	—
O128 (4)	1	2	—	1	—	—	1	1	1	1	1
Not detected (34)	13	10	15	7	26	9	12	13	9	6	8
Total (102)	42 (41.17)	37 (36.27)	29 (28.43)	42 (41.17)	60 (58.82)	28 (27.45)	43 (42.15)	43 (42.15)	40 (39.21)	23 (22.54)	24 (23.52)