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Avian Dis. 1983 Jul-Sep;27(3):623-31.

Maternal antibody and its effect on infectious bursal disease immunization.


Chickens vaccinated with infectious bursal disease virus (IBDV) early in life and revaccinated with an inactivated, oil-adjuvant IBDV vaccine at 18 weeks of age produced and maintained high levels of virus-neutralizing (VN) antibody through 10 months of lay. VN-antibody titers of chicks hatched from eggs laid during the same period closely matched the average VN-antibody titers of the dams. A sequential study of the decline rates of IBDV maternal antibody (MAB) in unvaccinated and IBDV-vaccinated chicks showed that the vaccine virus did not accelerate the antibody depletion rate in vaccinated chicks. Chicks carrying high IBDV MAB showed no active immune response to vaccination with commercial IBDV vaccines. They were also refractory to a pathogenic field isolate of IBDV (FV). However, chicks with low levels of MAB responded to both vaccine virus and the FV, although their response to vaccine virus was milder and delayed.

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