2005
DOI: 10.1590/s1516-635x2005000100009
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Infectious bursal disease: evaluation of maternal immunity and protection by vaccination of one-day old chicks against challenge with a very virulent virus isolate

Abstract: Broiler chicks belonging to two poultry companies, A and B, with different breeders' vaccination programs were challenged with a very virulent strains of infectious bursal disease virus (vvIBDV), genotyped as G11. Birds were separated in four groups, two vaccinated at the first day of life and two unvaccinated. They were then challenged at the 1st, 4th, 7th, 10th, 13th, 16th, 19th and 22nd days. At every day of challenge, before and after the procedure, the following data were collected from each group: Bursa … Show more

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Cited by 18 publications
(14 citation statements)
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“…The scoring of the various IBD lesions in bursa of Fabricius was done, as shown in Table-2 , based on the criterion and method as adopted by previous researchers such as Moraes et al . [ 34 ].…”
Section: Resultsmentioning
confidence: 99%
“…The scoring of the various IBD lesions in bursa of Fabricius was done, as shown in Table-2 , based on the criterion and method as adopted by previous researchers such as Moraes et al . [ 34 ].…”
Section: Resultsmentioning
confidence: 99%
“…Early vaccine failed to stimulate the immune system in the chicks because maternal antibody reacts with live vaccine virus and becomes neutralised or interferes with MDA (Zhuo et al 1998 ). Several studies under laboratory conditions have indicated that high MDA at the time of IBDV vaccination might interfere with the vaccine response, neutralises the vaccine virus and delays or even prevents the induction of humoral immunity (Hair-Bejo et al 2004 ; Jung 2006 ; Morães et al 2005 ). This means that the vaccination in the first days failed to offer the chick any protection against disease.…”
Section: Discussionmentioning
confidence: 99%
“…Currently, the evaluation of bursal lymphoid depletion depends on a subjective histological evaluation therefore susceptible to errors. In fact, a lesion score has been reported in order to minimize possible subjective errors (Pereira 2002, Moraes et al 2005.…”
Section: Introductionmentioning
confidence: 99%