Herpesvirus Turkey - Infectious Bursal Disease (HVT-IBD) Vector Vaccine - Compatibility With Marek's Disease (MD) Ripens Vaccines Injected At Day-Old To Pullets
Lemiere Stephane, Wong Yit Siam, Saint Gerard Anne Lise, Goutebroze Sylvain & Le Gros Francois Xavier | XVII WVPA Congress Cancun | 2011
Mixtures of HVT and Rispens poultry vaccines have been used worldwide for over 20 years, mainly for vaccination of future layers and breeders. With increasing virulence of MD virus strains, vaccination strategies are evolving towards the use of HVT plus Rispens combined vaccines. A single vaccination either in ovo or at one day of age with the HVT-IBD vector vaccine is efficient against IBD. However, with vaccination programs that include a hatchery administration of the HVT+IBD vaccine, additional protection against very virulent (vv) and very virulent-plus (vv+) MD viruses is needed, especially for layers and breeders. This study looked at the combination of four commercially available Rispens vaccines with the HVT-IBD vector vaccine injected at day old. MD challenge tests that were superior to 90% in relative score in all the groups vaccinated with both vaccines showed that the mixture of HVT-IBD and Rispens vaccines had no effect on clinical protection against MD, and IBD challenge tests showed that the mixture of HVT-IBD and Rispens vaccines has no effect on clinical protection against IBD that was equal to 100% in all the groups vaccinated with both vaccines.
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