Table 2 Results from the univariable logistic regression analysis of variables significantly (P ≤ 0

Herd factors

Breed

0: Swedish red and white

18

33

1: Swedish Holstein

21

21

2: Other

0

1

0.15*

Age at weaning

0: 6-8 weeks of age

22

20

1: 9-11 weeks of age

7

15

2: 12-16 weeks of age

7

13

0.20*

Proportion of dead calves/20 born calves

0: 0%

24

19

1: 5%

11

12

2: ≥ 10%

4

18

0.01

Proportion of calves having diarrhea/20 born calves

0: < 5%

16

1

1: 5-20%

17

7

2:>20%

6

42

< 0.001

Age at sampling

0: 0-11 days

11

23

1: 12-21 days

18

13

2: ≥ 22 days

10

19

0.07*

Herd size (no of cows)

0: < 55

21

10

1: 55-120

14

19

2: ≥ 121

4

25

< 0.001*

Milk calf feeder?

0: No

28

28

1: Yes

10

26

0.03*

Usage of other antibiotics to treat diarrhea

0: Never

30

20

1: Sometimes/Often

7

33

< 0.001

Antimicrobial resistance

Resistant to ampicillin

0: No

34

35

1: Yes

7

19

0.05*

Resistant to streptomycin

0: No

27

26

1: Yes

14

28

0.08*

Resistant to tetracycline

0: No

36

29

1: Yes

5

25

< 0.01*

Resistant to sulphonamide

0: No

34

31

1: Yes

7

23

< 0.01*

Multiresistant (resistant to at least three antibiotics (Am, Sm, Tc and/or Su))

0: No

37

37

1: Yes

4

19

< 0.01

Presence of virulence genes

Presence of terZ

0: No

24

1

1: Yes

11

10

< 0.01

Presence of astA

0: No

28

8

1: Yes

5

5

0.09

Presence of EAST

0: No

33

37

1: Yes

6

18

0.06*