Infectious Bursal Disease: Pathogenicity and Immunogenicity of Vaccines

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dc.creatorE Camilotti
dc.creatorLB Moraes
dc.creatorTQ Furian
dc.creatorKA Borges
dc.creatorHLS Moraes
dc.creatorCTP Salle
dc.date2016
dc.date.accessioned2026-07-07T03:24:03Z
dc.descriptionThe Infectious Bursal Disease (IBD) is a contagious viral disease that affects young chickens and may cause high morbidity and mortality. As the virus is very resistant to the environment, vaccination is required in case of high infection pressure. Due to variations in the virulence degree of the vaccines available to control IBD, this study aimed at evaluating the pathogenicity and immunogenicity of three types of vaccines. In total, 220 one-day-old specific pathogen free (SPF) chickens were immunized with recombinant, immune-complex and intermediate vaccines, or not vaccinated (55 birds per group) and challenged with IBD G11 strain on day 25. On days 25, 30, and 35, the Bursa of Fabricius (BF) were submitted to gross and histological examination, and serum samples were submitted to ELISA to determined anti-IBD antibody titers. On day 23, chickens were submitted to the test of hypersensitivity to phytohemagglutinin to evaluate the immunosuppressive effect of vaccines on the cell-mediated immunity. The results have indicated that the immune-complex vaccine induced the most severe BF lesions, whereas the recombinant vaccine preserved BF tissue and cell integrity. The three evaluated vaccines induced humoral immunity of similar intensity. The cellular reaction to phytohemagglutinin of the chickens immunized with recombinant and immune-complex vaccines was less severe compared with the unvaccinated chickens. In conclusion, these results indicate that the immune-complex vaccine was the most pathogenic and that all vaccines were effective in protecting SPF chickens against IBD.
dc.formatapplication/pdf
dc.identifier1516-635X
dc.identifierhttps://www.redalyc.org/articulo.oa?id=179746750015
dc.identifier.urihttp://hdl.handle.net/123456789/432810
dc.languageen
dc.publisherFundação APINCO de Ciência e Tecnologia Avícolas
dc.relationhttp://www.redalyc.org/revista.oa?id=1797
dc.rightsRevista Brasileira de Ciência Avícola
dc.sourceRevista Brasileira de Ciência Avícola (Brasil) Num.2 Vol.18
dc.subjectAgrociencias
dc.titleInfectious Bursal Disease: Pathogenicity and Immunogenicity of Vaccines
dc.typeartículo científico

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Revista Brasileira de Ciência Avícola - Fundação APINCO de Ciência e Tecnologia Avícolas