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Table 3 Results of culture and PCR for Mycobacterium avium subsp. paratuberculosis in 17 infected herds

From: Observed management practices in relation to the risk of infection with paratuberculosis and to the spread of Mycobacterium avium subsp. paratuberculosisin Swiss dairy and beef herds

Herd

Production type

Herd size (all cattle > 2 years)

Number of animals < 2 years

Prevalence of PCR positive animals > 2 years (%)

Prevalence of culture positive animals > 2 years (%)

Prevalence of culture positive animals < 2 years (%)

Total (mean)

Dairy

60.2

12.5

0.7

6.0

3.2

Total (mean)

Beef

44.4

11.7

2.9

6.4

4.9

1

Dairy

82

6

0

1.2

0.0

2

Dairy

53

0

0

1.9

N/A1

3

Dairy

28

5

0

3.6

0.0

4

Dairy

66

22

0

4.5

9.1

5

Dairy

39

10

2.6

5.1

0.0

6

Dairy

57

1

0

5.3

N/A1

7

Dairy

48

0

0

6.3

N/A1

8

Dairy

55

15

1.8

7.3

0.0

9

Dairy

81

29

1.2

7.4

3.4

10

Dairy

93

37

1.1

12.9

2.7

11

Beef

54

12

1.9

1.9

0.0

12

Beef

41

7

0

2.4

0.0

13

Beef

56

21

0

3.6

4.8

14

Beef

28

12

3.6

7.1

8.3

15

Beef

77

15

2.6

7.8

0.0

16

Beef

31

14

0

12.9

14.3

17

Beef

24

1

12.5

16.7

N/A1

  1. 1 N/A = not applicable; no prevalence could be calculated for farms 2 and 7 with no animals < 2 years and for farms 6 and 17 with only one animal < 2 years at the time of the farm visit.