Estimating transfer of bovine virus-diarrhoea virus ...

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Title Estimating transfer of bovine virus-diarrhoea virus in Danish cattle by use of register data
Author(s) L. Alban, Henrik E. Stryhn, A. M. Kjeldsen, A. K. Ersboll, F. Skjoth, J. Christensen, V. Bitsch, M. Chriel, U. Stroger
Journal Preventive Veterinary Medicine
Date 2001
Volume 52
Issue 2
Start page 133
End page 146
Abstract To study how routinely recorded data (also called "register data") might be used in disease monitoring on a regional or national level, a database for bovine virus-diarrhoea virus (BVDV) was made from existing databases, covering the period January 1995-November 1999. This paper includes a general description of the database, including basic statistics for selected variables. Information was largely complete for cattle herds in the milk-recording scheme (MRS), but only partly available for other herds. A methodology was developed to identify when and how a herd initially was infected. For most herds, it was possible to determine when and how BVDV first was introduced. Among the infected herds, most were already infected by the start of the study. BVDV had been present in 40% of the MRS herds and in 9% of the non-MRS herds. In the MRS herds, most new infections were associated with a dam that had been present in the same herd during gestation. Among the non-MRS herds, most new infections were associated with movement of a persistently infected animal. The monthly number of newly infected herds is presented; it is seen that the incidence declined substantially during the study period.

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