Experiences from the Danish programme for eradication of bovine virus diarrhoea (BVD) 1994–1998 with special reference to legislation and causes of infection

摘要: The main experiences from the Danish bovine virus diarrhoea (BVD) eradication programme over 5 years 1994 to 1999 are presented. last 3 of has been strongly supported by legislation. most important regulations have blood testing live animals before movement other herds, common pastures or exhibitions, and monitoring all herds at regular intervals for presence infection. Nevertheless, free experienced infection, e.g., 204 dairy in 1998. Of found be infected period July 1997 through June 1998 after previously having registered BVD-free, 67 were thoroughly investigated. Nineteen (28%) because purchase pregnant cows heifers which delivered persistently (PI) calves, 24 (36%) two (3%) PI on neighbouring farm houses, respectively. In five (7%) had become one same pasture, while 17 (25%) no immediate cause infection could demonstrated. Yet, airborne spread as a source was suspected some these cases. It furthermore concluded investigations presented, that antibody-positive AI bulls remote but unlikely possibility. Free-living deer Denmark considered uninfected. Presence PI-animals sheep farms seen is paid attention individual results underline need legislation used programmes areas with high prevalence introduced right beginning order minimise risk herds.