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Table 1 Virulence profiles and antimicrobial resistance of E. coli from healthy broilers

From: Phylogenetic grouping, epidemiological typing, analysis of virulence genes, and antimicrobial susceptibility of Escherichia coli isolated from healthy broilers in Japan

 

No. (%) of positive strains

 

Virulence-associated gene/antimicrobial

A

B1

B2

D

Total

(n = 35)

(n = 28)

(n = 1)

(n = 14)

(n = 78)

iutA

6 (17.1)a

7 (25.0)a

 

10 (71.4)b

23 (29.5)

iss

2 (5.7)a

8 (28.6)

 

6 (42.9)b

16 (20.5)

cvaC

2 (5.7)a

2 (7.1)a

 

5 (35.7)b

9 (11.5)

tsh

1 (2.9)

1 (3.6)

 

3 (21.4)

5 (6.4)

iroN

4 (11.4)a

8 (28.6)

 

7 (50.0)b

19 (24.4)

hlyF

4 (11.4)a

9 (32.1)

 

9 (64.3)b

22 (28.2)

ompT

5 (14.3)a

9 (32.1)

 

9 (64.3)b

23 (29.5)

Ampicillin

16 (45.7)

10 (35.7)

1

7 (50.0)

34 (43.6)

Cefazolin

6 (17.1)

4 (14.3)

 

4 (28.6)

14 (17.9)

Ceftiofur

4 (11.4)

4 (14.3)

 

4 (28.6)

12 (15.4)

Dihydrostreptomycin

11 (31.4)

10 (35.7)

 

7 (50.0)

28 (35.9)

Gentamicin

2 (5.7)

1 (3.6)

  

3 (3.8)

Kanamycin

7 (20.0)

2 (7.1)

 

3 (21.4)

12 (15.4)

Oxytetracycline

19 (54.3)

13 (46.4)

1

9 (64.3)

42 (53.8)

Chloramphenicol

5 (14.3)

4 (14.8)

 

1 (7.1)

10 (12.8)

Colistin

1 (2.9)

   

1 (1.3)

Nalidixic acid

11 (31.4)

10 (35.7)

 

9 (64.3)

30 (38.5)

Enrofloxacin

5 (14.3)

4 (14.3)

 

1 (7.1)

10 (12.8)

Trimethoprim

9 (25.7)

12 (42.9)

 

3 (21.4)

24 (30.8)

  1. A significant difference (P < 0.05) in prevalence was observed between a and b.