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Table 4 Bovine viral diarrhoea (BVD) herd status for 111 herds in Ireland during 2009 (based on a comparison of bulk milk and pooled serum BVDV antibody results) in non-vaccinated herds

From: Bovine viral diarrhoea virus seroprevalence and vaccination usage in dairy and beef herds in the Republic of Ireland

BVD herd status based on bulk milk analysis (PP ≥ 2.5) BVD herd status
(PP 2.12) (PP 7.58)
Negative Positive Negative Positive
Negative 1 4 2 3
Positive 0 60 0 60
% agreement in classification 93.8% 95.4%
(κ-value) (0.32) (0.55)
  1. The pooled serum results are separately presented at two different cut-off percentage positivity (PP) values (2.12 and 7.58). The level of agreement in BVD herd status, for non-vaccinated herds at each of the two cut-offs is presented, using kappa statistics.