Field trials with a bivalent vaccine (HVT and SB-1) against Marek's disease.

Abstract

White leghorn chickens on five farms were given a bivalent Marek's disease (MD) vaccine consisting of turkey herpesvirus (HVT) and SB-1 (a nononcogenic MD virus); other chickens received only HVT. The farms had histories of "vaccination failures," presumably owing to an exceptionally virulent challenge MD virus. The bivalent vaccine uniformly protected chickens better than HVT alone between 12 and 16-20 weeks of age, when serious MD losses occurred. During that period, total mortality in groups given both viruses ranged from 0.39 to 1.26% (mean 0.86%), whereas that in HVT-vaccinated groups not exposed to SB-1 varied from 1.92 to 7.44% (mean 3.43%). Chickens in pens or rows with close contact to those given bivalent vaccine also had low MD mortality rates (0.46-1.06%, mean 0.77%), probably from the spread of SB-1.

• Authors: B W Calnek, K A Schat, M C Peckham, J Fabricant
• Journal: Avian diseases (Avian Dis) 1983 Jul-Sep Vol. 27 Issue 3 Pg. 844-9 ISSN: 0005-2086 [Print] United States
• PMID: 6314982 (Publication Type: Journal Article, Research Support, U.S. Gov't, Non-P.H.S., Research Support, U.S. Gov't, P.H.S.)

Chemical References

• Viral Vaccines

Topics

• Animals
• Chickens
• Herpesviridae (immunology)
• Herpesvirus 2, Gallid (immunology, pathogenicity)
• Marek Disease (mortality, prevention & control)
• Turkeys (microbiology)
• Viral Vaccines
• Virulence