Post Vaccinal, Observation In Lymphoidal, Organs (Bursa, Spleen, Thymus) Of Broiler Chicks Inoculated
By: Shajeela Irum
| Dr.Sameera Akhtar.
Contributor(s): Dr.Muhammad Amin Sheikh | Dr.Shakil | Faculty of Veterinary Sciences.
Material type: 
BookPublisher: 1999Subject(s): Department of MicrobiologyDDC classification: 0606,T Dissertation note: Infectious bursal disease (IBD) is a viral infection of chickens, causing degeneration of bursa of Fabricius and producing suppression in humoral immune response. Different vaccines are available in the market for mass scale immunization of chickens. Some contain more virulent and invasive strains than the others. Since the primary site of infection and inducement of lesions by IBDV is the hursa of Fabricius, the effect on the immune system may be significantly suppressive. This study compared two intermediate (228-E and BUR 706) and a mild (Gumborol CT) vaccinal strains of IBDV in terms of their ability to induce an antibody response and to cause damage to different lymphoid organs in chickens.
A total of 250 chicks (divided into 4 groups) were vaccinated with different strains of IBDV and the antibody levels were monitored using indirect haemagglutination (IHA) test every week post-vaccination upto 5 weeks. IHA revealed that the vaccinated with 228-E or BUR-706 had significantly higher antibody titers (GMT 8.0, 7.7, respectively) as compared to Gumborol CT vaccinated birds (GMT 3.0) on 35 days post-inoculation, On day 25 post-vaccination, some birds from each group were challenged with a fully virulent field strain of IBDV, to study whether the antibody levels were protective than the unvaccinated ones. Furthermore intermediate strains were found to be more damaging to the bursae and spleens than the milder one since lower bursal and splenic body weight ratios were recorded in them.
The study suggested the use of intermediate strains a vaccine since they induced high antibody titers as compared to that of the milder strain. However, more invasive and pathogenic intermediate strains used in this study caused more damage to the lymphoid organs harbouring B cells. So the need exists for an effective infectious bursal disease vaccine, low in virulence, which could be applied by a mass vaccination in chickens conferring excellent protection against the disease with minimum immunosuppressive effects.
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Thesis
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UVAS Library Thesis Section | Veterinary Science | 0606,T (Browse shelf) | Available | 0606,T |
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Infectious bursal disease (IBD) is a viral infection of chickens, causing degeneration of bursa of Fabricius and producing suppression in humoral immune response. Different vaccines are available in the market for mass scale immunization of chickens. Some contain more virulent and invasive strains than the others. Since the primary site of infection and inducement of lesions by IBDV is the hursa of Fabricius, the effect on the immune system may be significantly suppressive. This study compared two intermediate (228-E and BUR 706) and a mild (Gumborol CT) vaccinal strains of IBDV in terms of their ability to induce an antibody response and to cause damage to different lymphoid organs in chickens.
A total of 250 chicks (divided into 4 groups) were vaccinated with different strains of IBDV and the antibody levels were monitored using indirect haemagglutination (IHA) test every week post-vaccination upto 5 weeks. IHA revealed that the vaccinated with 228-E or BUR-706 had significantly higher antibody titers (GMT 8.0, 7.7, respectively) as compared to Gumborol CT vaccinated birds (GMT 3.0) on 35 days post-inoculation, On day 25 post-vaccination, some birds from each group were challenged with a fully virulent field strain of IBDV, to study whether the antibody levels were protective than the unvaccinated ones. Furthermore intermediate strains were found to be more damaging to the bursae and spleens than the milder one since lower bursal and splenic body weight ratios were recorded in them.
The study suggested the use of intermediate strains a vaccine since they induced high antibody titers as compared to that of the milder strain. However, more invasive and pathogenic intermediate strains used in this study caused more damage to the lymphoid organs harbouring B cells. So the need exists for an effective infectious bursal disease vaccine, low in virulence, which could be applied by a mass vaccination in chickens conferring excellent protection against the disease with minimum immunosuppressive effects.
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