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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.