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Principles for eradication of bovine viral diarrhoea virus (BVDV) infections in cattle populations

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Principles for eradication of bovine viral diarrhoea virus (BVDV) infections in cattle populations

Auteurs : Ann L. E Lindberg ; Stefan Alenius

Source :

Veterinary Microbiology [ 0378-1135 ] ; 1999.

RBID : ISTEX:AA73F9D5DFFEAE74688CF68205383A32D57003FB

English descriptors

Teeft :
- Alenius, Antibody, Assay, Bitsch, Bolin, Border disease, Bovine, Bovine virus diarrhoea virus, Brownlie, Bulk milk, Bulk milk test, Bulk milk tests, Bulk tank milk, Bvdv, Bvdv control, Bvdv infection, Bvdv infections, Bvdv status, Bvdv strains, Bvdv type, Bvdv vaccines, Cattle population, Clearance, Control measures, Control scheme, Current infection, Dairy herd, Dairy herds, Diarrhea virus, Diarrhoea, Diarrhoea virus, Disease clearance, Early pregnancy, Early stage, Embryo, Eradication, Eradication schemes, Esvv, Esvv symp, European symp, Foetus, Food animal practice, Herd, High antibody levels, Houe, Important risk factors, Indirect antibody elisaa, Infection, Initial herd investigation, Initial test, Larsson, Late pregnancy, Lelystad, Lindberg, Livestock trade, Maternal antibodies, Microbiology, Mucosal disease, Niskanen, Other animal, Other herds, Paton, Pestivirus, Pestivirus infections, Plausible ways, Pregnancy, Pregnant animals, Preventive measures, Proc, Risk factors, Scandinavian control, Screening test, Semen, September, Seronegative, Seronegative animals, Seropositive, Spot test, Spot tests, Such herds, Susceptible animal, Susceptible animals, Symp, Transient infection, Transient infections, Transiently, Undetectable, Undetectable levels, Vaccine, Verdier klingenberg, Viral, Viral diarrhea virus, Virus, Virus clearance, Virus detection, Virus isolation, Waage, Wensvoort, Young stock, Young stock months.

Abstract

Abstract: Systematic eradication of BVDV without vaccination started in Scandinavia in 1993. In principle, the schemes include; (1) identification of non-infected and infected herds using different combinations of serological herd tests such as bulk milk tests and spot tests (sample of animals in a certain age), (2) monitoring/certification of non-infected herds by repeated sampling, applying one of the above-mentioned methods and (3) virus clearance in infected herds aimed at removing persistently infected (PI) animals in a cost- and time-efficient manner. In the virus clearance protocol described, an initial test is performed on all animals with subsequent follow-up of calves born as well as of dams seronegative in the initial test. It is generally recommended to perform an initial antibody test on all samples. This should be done not only to screen for seronegative animals on which virus isolation should be attempted (i.e. possible PI animals), but more in order to identify non-immune animals in reproductive age, that is, the key animals in herd-level persistence of infection. In Sweden, a common finding has been self-clearance, where the infection ceases without any other intervention than controlled introduction of new animals. Other epidemiological observations concern the course of events following virus introduction. Important risk factors for spreading BVDV are discussed, where livestock trade is perceived as the most central to control. Live vaccines, imported semen and embryos constitute special hazards, since they may act as vehicles for the introduction of new BVDV strains. The importance of making farmers aware of herd biosecurity and their own responsibility for it is stressed, and in order to maintain a favourable situation after a scheme has been concluded, effort must be put into establishing such a persisting attitude in the farming community.

Url:

https://api.istex.fr/ark:/67375/6H6-WRWTVB7Q-V/fulltext.pdf

DOI: 10.1016/S0378-1135(98)00270-3

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Ann L. E Lindberg

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</affiliation>

Stefan Alenius

<affiliation><mods:affiliation>National Veterinary Institute, Box 7073, S-750 07UppsalaSweden</mods:affiliation>
<wicri:noCountry code="subField">07UppsalaSweden</wicri:noCountry>
</affiliation>

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<term>Bovine virus diarrhoea virus</term>
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<front><div type="abstract" xml:lang="en">Abstract: Systematic eradication of BVDV without vaccination started in Scandinavia in 1993. In principle, the schemes include; (1) identification of non-infected and infected herds using different combinations of serological herd tests such as bulk milk tests and spot tests (sample of animals in a certain age), (2) monitoring/certification of non-infected herds by repeated sampling, applying one of the above-mentioned methods and (3) virus clearance in infected herds aimed at removing persistently infected (PI) animals in a cost- and time-efficient manner. In the virus clearance protocol described, an initial test is performed on all animals with subsequent follow-up of calves born as well as of dams seronegative in the initial test. It is generally recommended to perform an initial antibody test on all samples. This should be done not only to screen for seronegative animals on which virus isolation should be attempted (i.e. possible PI animals), but more in order to identify non-immune animals in reproductive age, that is, the key animals in herd-level persistence of infection. In Sweden, a common finding has been self-clearance, where the infection ceases without any other intervention than controlled introduction of new animals. Other epidemiological observations concern the course of events following virus introduction. Important risk factors for spreading BVDV are discussed, where livestock trade is perceived as the most central to control. Live vaccines, imported semen and embryos constitute special hazards, since they may act as vehicles for the introduction of new BVDV strains. The importance of making farmers aware of herd biosecurity and their own responsibility for it is stressed, and in order to maintain a favourable situation after a scheme has been concluded, effort must be put into establishing such a persisting attitude in the farming community.</div>
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Principles for eradication of bovine viral diarrhoea virus (BVDV) infections in cattle populations

Principles for eradication of bovine viral diarrhoea virus (BVDV) infections in cattle populations

Source :

English descriptors

Abstract

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