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Table 3 Risk factors associated with high and low bovine respiratory syncytial virus prevalence at herd level in 26 dairy cattle herds in São Paulo State, Brazil

From: Bovine respiratory syncytial virus seroprevalence and risk factors in non-vaccinated dairy cattle herds in Brazil

Factor

Condition

BRSV status

RR

CI (95%)

p value

High

Low

Limit inferior

Limit Superior

Herd size (> 75 animals)

Yes

3

2

1.40

0.59

3.34

0.422

No

9

12

Herd density (> 5 animals/ha)

Yes

5

4

1.34

0.60

3.05

0.387

No

7

10

Breed (Holstein)

Yes

7

7

1.20

0.51

2.81

0.488

No

5

7

Type of reproduction (natural mating)

Yes

2

8

0.32

0.09

1.17

0.420

No

10

6

Purchasing of animals (last six months)

Yes

6

10

0.63

0.28

1.41

0.237

No

6

4

Cleaning of facilities (rarely)

Yes

7

9

0.88

0.38

2.01

0.536

No

5

5

Historical of respiratory disease (last six months)

Yes

7

6

1.40

0.60

3.28

0.347

No

5

8

Quarantine (absence)

Yes

10

11

1.19

0.37

3.81

0.578

No

2

3

Abortions

Yes

5

6

0.97

0.42

2.26

0.632

No

7

8

Type of calves housing (collective)

Yes

9

14

0.39

0.24

0.65

0.085

No

3

0

Type of calves feeding (natural suckling)

Yes

3

10

0.33

0.12

0.96

0.023

No

9

4

Presence of others domestic animals

Yes

11

13

0.92

0.21

3.92

0.720

No

1

1

Presence of wild ruminant animals

Yes

5

9

0.61

0.26

1.43

0.224

No

7

5