Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 109523
Title Risk factors for introduction of BHV1 into BHV1-free Dutch dairy farms : a case-control study
Author(s) Schaik, G. van; Schukken, Y.H.; Nielen, M.; Dijkhuizen, A.A.; Benedictus, G.
Source Veterinary Quarterly 23 (2001)2. - ISSN 0165-2176 - p. 71 - 76.
Department(s) Agrarische Bedrijfseconomie
Publication type Refereed Article in a scientific journal
Publication year 2001
Abstract In May 1998, a compulsory eradication programme for BHV1 started in the Netherlands. In December 1999 approximately 24␘f Dutch dairy farms were certified BHV1-free (Animal Health Service (AHS)). Ninety-three certified BHV1-free dairy farms participated in a cohort study that investigated the probability of introduction of infectious diseases. The probability of introduction of BHV1 was determined from March 1997 until April 1999. Ninety of these farms remained BHV1-free and could be used as control farms. From January 1997 until March 1998, BHV1 was introduced into 41 BHV1-free dairy farms in the Netherlands (case farms). Management data were collected for both cases and controls and were complete for 37 case farms and 82 control farms. For small data sets and for data in which both low and high frequencies were expected in the contingency tables, the asymptotic methods were unreliable. Our data set clearly resembled such a data set; the risk factors were rare events because the BHV1-free farms were closed farms on which few direct animal contacts occurred. Therefore, an exact stratified modelling approach was most suitable for the data. The study showed that dairy farms should prevent cattle from escaping or mingling with other cattle and that professional visitors should always wear protective farm clothing.
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