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2nd European Symposium on BVDV Control

Joe Brownlie Royal Veterinary College. Family: FLAVIVIRIDAEHuman Veterinarygenus: flavivirus yellow fever virus louping ill virus (LIV) japanese encephalitis v*. West Nile fever*genus: pestivirusbovine virus

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2nd European Symposium on BVDV Control

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    1. 2nd European Symposium on BVDV Control

    3. Establishing a disease control programme Husbandry and stockmanship Strategic testing Buying and culling policies Vaccination programmes

    4. BVD Vaccine Options Do Nothing Use of PI animal Vaccinate

    5. Dairy farmer’s opinion Garret de Vries BVD not at all on my top ten priority list many, many other priorities, eg: feed costs, equipment, labor, etc… vaccinated for the past 15 years ‘the vaccine takes care of the problem’

    7. BVD Vaccine Options Do Nothing Use of PI animal Vaccinate Eradicate

    8. BVD - Status in Europe

    9. BHV1 - Status in Europe

    10. Vaccines – why bother?

    18. Immune Animal Resists Challenge

    19. Faded Immunity Virus Breaches

    29. In Utero Challenge (112 days p.v)

    30. Do vaccines work in the field?

    33. So why do vaccines fail?

    34. In utero protection is an all or nothing affair!

    35. BVDV: Effects on Reproduction Infection during early pregnancy (Day 1-24) Embryonic Mortality 22% conception in infected heifers 79% conception in uninfected heifers (Virakul 1988) 33% pregnancy rate at 77 days c.f. 79% (McGowan 1993)

    38. The Bull Can be PI May have poor fertility Source of Virus Can meet virus as an adult Effects on fertility Disease may be severe ALWAYS TEST THEM

    40. The bull can transmit BVDV

    41. Even this bull can transmit BVDV!

    43. Vaccines in the Dairy Industry in the USA 75% of producers use a BVD vaccine

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