Shiga Toxin-Producing Escherichia coli Isolated from Bovine Mastitic Milk: Serogroups, Virulence Factors, and Antibiotic Resistance Properties

Table 9

Antibiotic resistance properties in STEC serogroups isolated from bovine mastitis (disk diffusion method).

STES; Serogroups	P10*	TE30	S10	C30	SXT	GM10	NFX5	L2	CF30	CIP5	TMP5	F/M300	AM10
O157; (11)	11	9	6	4	8	2	4	5	1	2	3	1	6
O26; (15)	15	11	10	6	4	2	3	10	—	1	5	1	8
O103; (3)	3	3	1	1	2	1	—	2	—	—	2	1	2
O111; (-)	—	—	—	—	—	—	—	—	—	—	—	—	—
O145; (3)	3	—	1	1	1	—	—	1	—	—	1	—	—
O45; (2)	2	1	1	2	—	—	1	—	1	—	—	—	1
O91; (6)	6	—	3	1	2	1	2	4	—	1	1	1	3
O113; (3)	3	1	—	1	—	2	—	2	—	—	2	—	1
O121; (2)	2	1	—	1	1	—	—	1	1	—	—	1	1
O128; (2)	2	1	1	1	1	—	1	1	—	1	1	—	—
Total; (47)	47; (100)	27; (57.44)	23; (48.93)	18; (38.29)	19; (40.42)	8; (17.02)	11; (23.40)	26; (55.31)	3; (6.38)	5; (10.63)	15; (31.91)	5; (10.63)	22; (46.80)

*In this table, P10: penicillin (10 u/disk); TE30: tetracycline (30 𝜇g/disk); S10: streptomycin (10 μg/disk); C30: chloramphenicol (30 μg/disk); SXT: sulfamethoxazole (25 μg/disk); GM10: gentamycin (10 μg/disk); NFX5: enrofloxacin (5 μg/disk); L2: lincomycin (2 μg/disk); CF30: cephalothin (30 μg/disk); CIP5: ciprofloxacin (5 μg/disk); TMP5: trimethoprim (5 μg/disk); F/M300: nitrofurantoin (300 μg/disk); AM10: ampicillin (10 u/disk).