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United States Department of Agriculture

Agricultural Research Service

Research Project: Evaluation of Newcastle Disease Virus Vaccines Against Circulating Viruses Project Number: 6040-32000-064-06
Project Type: Trust

Start Date: Mar 01, 2011
End Date: Feb 28, 2014

1. Determine vaccine efficacy following vaccination with inactivated Newcastle disease virus antigen vaccine against highly pathogenic Newcastle disease virus challenge. 2. Determine seroconversion against Newcastle disease virus (NDV) following vaccination of 4 week old specific pathogen free (SPF) chickens with inactivated NDV vaccines.

1. Viruses representative of circulating genotypes will be grown to high titers in eggs. 2. Amount of antigen to be used will be compared and standardized using a monoclonal antibody that recognizes a highly conserved epitope present in all viruses. 3. The antigen will be denatured using standard techniques and injected in 4 week SPF chickens to determine immune response and protection against NDV challenge. 4. Efficacy will be determined using high pathogenicity Newcastle disease virus in 4 week old SPF chicken with measurement of protection being prevention of morbidity and mortality, reduction in number of infected birds, and a decrease in the NDV-shed from respiratory and alimentary tracts. 5. Two antigens from genotype VI and VII will be compared to a mock vaccinated and to a standard vaccine based on a lentogenic virus and three different challenge viruses will be used (4x3 a total of 12 cages).

Last Modified: 12/1/2015
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