Efficacy of lyophilized turkey herpesvirus vaccine against Marek's disease in broilers.
Field trials involving approximately 1,250,000 chickens vaccinated with cell-free turkey herpesvirus (HVT) vaccine and 635,000 chickens vaccinated with cell-associated HVT vaccine howed both vaccines equally effective in reducing condemnations (attributable to Marek's disease) at the poultry processing plant. Vaccinated chickens were progeny of hens vaccinated at 1 day of age with cell-associated HVT vaccine. The maternal antibody did not interfere with the ability of either the cell-free or cell-associated HVT vaccine to provide protection for chickens against challenge from the virulent Marek's disease virus.
D000818:Animals; D002474:Cell-Free System; D002645:Chickens; D006564:Herpesviridae / Q000276:immunology*; D008380:Marek Disease / Q000453:epidemiology / Q000517:prevention & control*; D014422:Turkeys; D014765:Viral Vaccines
D014765:Viral Vaccines