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Epidemiological Studies of BVDV and Herpes Virus Infections in AI Centers in Lithuania
Mockeliūnienė, Violeta | Lietuvos veterinarijos akademijos Veterinarijos institutas |
Date Issued |
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2003-01-22 |
ISSN 1404-5915
ISBN 91-576-6281-9
Bovine viral diarrhoea virus (BVDV) belongs to the Pestivirus genus in the Flaviviridae family. Noncytopathogenic (ncp) biotype of the virus is characterized by a vertical virus transmission and is responsible for a permanent BVDV circulation in cattle population. The significant economic impact are inflicted due to productive and reproductive losses. Investigations of the causes of BVDV spreading and features of its manifestation and distribution are based not only on the analysis of the agent and its properties, ways of transmission and immune status of the animal, but also on the analysis of various other factors and their importance. The existing differences in the structure of cattle population, keeping and care conditions may cause variable distribution patterns of BVDV infection. Infectious bovine rhinotracheitis (IBR), also called infectious pustular vulvovaginitis, is an infectious disease caused by the bovine herpes virus type-1 (BHV-1). In young animals this disease manifests itself as an inflammation of the upper respiratory tract or encephalitis, whereas in adult animals the infection either causes no symptoms or manifests itself as balanoposthitis, vulvovaginitis and reproduction disorders. Preliminary serological investigations for IBR made in 1992 showed 52.5% seroprevalence in animals at artificial insemination (AI) and bull-growing centers. At the same time analysis of the relative importance of major diagnosis in cattle during the period 1992- 1993 revealed that up to 30 % and 6 % of cattle suffered from respiratory and genital diseases respectively. Based on these investigations, the Lithuanian infectious bovine rhinotracheitis/pustular vulvovaginitis (IBR/IPV) control programme was developed and approved on 7 October, 1993. The major goals of the current survey were: (1) to investigate the prevalence and incidence of BHV-1 and BVDV infections in AI centers bulls; (2) to investigate the qua[...].