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Research Detail

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Narayan Chandra Paul
Department of Microbiology & Hygiene, Faculty of Veterinary Science, Bangladesh Agricultural University (BAU), Mymensingh 2202, Bangladesh,

M Shahidur Rahman Kahn
Department of Microbiology & Hygiene, Faculty of Veterinary Science, Bangladesh Agricultural University (BAU), Mymensingh 2202, Bangladesh,

Shaiful Islam
Bangladesh Livestock Research Institute (BLRI), Savar, Dhaka 1344, Bangladesh.

AHM Taslima Akhter
Department of Microbiology & Hygiene, Faculty of Veterinary Science, Bangladesh Agricultural University (BAU), Mymensingh 2202, Bangladesh,

Niraj Kanti Shil
Department of Medicine, Faculty of Veterinary Science, Bangladesh Agricultural University (BAU), Mymensingh 2202, Bangladesh.

An investigation was conducted with a view to determining the persistence of maternally-derived antibody (MDA) against infectious bronchitis virus (IBV) in chicks as well as seroconversion of IBV in relation to age and gender of chicks in field condition. Determination of antibody titre was performed by indirect enzymelinked immunosorbent assay (iELISA). The existence of MDA was calculated in Group A (n = 20) and Group B (n = 15) originating from parents vaccinated against IBV and with no such history respectively. In case of group A, titres of serum samples obtained were 5361.23 ± 854.09, 2567.58 ± 763.61, 808 ± 751.361, 432.29 ± 47.11, 178.36 ± 88.28, 184.58 ± 93.6, 80.89 ± 70.11 and 43.55 ± 32.92 on day 1, 5, 9, 13, 17, 21, 25 and 29 days aged birds respectively. On the other hand, sera samples of group B manifested a titre of 3285.18 ± 685.03, 2219.16 ± 419.77, 1783.62 ± 219.84, 589.01 ± 249.63, 186.66 ± 88.21, 178.36 ± 202.02, 105.77 ± 75.69 and 41.34 ± 69.28 on same schedule. It was further revealed that chicks with ancestor of non-vaccinated parents showed higher MDA titre up to 9th day of age. This might have happened due to exposure of field virus to the parent birds. As regards seroconversion, it was observed that 100, 20 and 80% of serum samples collected from chickens of 0-2 weeks, 3-4 weeks and 4 months of age were positive to IBV specific antibody respectively, whereas no serum sample was positive in case of 5-7 weeks aged birds. When considered the gender of birds, it was revealed that sera from the female showed 58.33% seropositivity against 25% from male. Maternally-derived antibody (MDA) might protect the chickens up to 9 days of age and since MDA could interfere vaccination, it should not be performed before such age.

  Maternally-derived antibody (MDA), Infectious bronchitis virus (IBV), antibody titre, Seroconversion, Chicks
  Palli Progoti Sahayak Samity (PPSS) at Faridpur, Society Development Committee (SDC), Talma, Faridpur, Bangladesh
  
  
  Socio-economic and Policy
  Social status

1.To detect the MDA titre in chicks originating from vaccinated and nonvaccinated parents

2.To study the seroconversion of IBV in relation to age and gender of chickens in selected areas of Bangladesh.

Study area: The study was conducted in the some selected areas in Bangladesh. Blood samples of broiler and layer chicken were collected from the farms of beneficiary of Palli Progoti Sahayak Samity (PPSS) at Faridpur, Society Development Committee (SDC), Talma, Faridpur, Bangladesh Extension Education Services (BEES), Chunarughat and Hobigonj Sadar, Centre for CommunityDevelopment Assistance (CCDA), Putizuri, Hobogonj and brought to the Department of Microbiology and Hygiene, Bangladesh Agricultural University (BAU), Mymensingh for further observation. Infectious bronchitis virus suspected field serum samples A total of 44 blood samples encompassing of 20 from different age groups and 24 with equal number from either gender were collected from different areas. Blood specimens were collected aseptically from the left jugular vein using 3-ml disposable sterile syringes and were kept slanted at 4-8°C for overnight to be clotted. Then the clotted blood was removed carefully with sterile needle and serum poured into sterilized graduated centrifuge test tubes. The sera were subjected to centrifugation at 1,000 rpm for 10 min for clarification. Then the clear sera were collected and kept in clean sterilized vials and stored at -20°C for further use. Serum samples collected from experimental chicks A total of 48 serum samples with equal number from two groups of experimentally reared chicks were obtained on different interval of age to study persistence of MDA. All chicks were reared up to 29 days. Thus, group A formed with 20 chicks from vaccinated parents stock, while the other group of 15 chicks (group B) originated from parents with no history of vaccination against IBV.

  Bangladesh J Microbiol, Volume 25, Number 1, June 2008, pp 53-56
  
Funding Source:
  

The existence of MDA was calculated in Group A (n = 20) and Group B (n = 15) originating from parents vaccinated against IBV and with no such history respectively. In case of group A, titres of serum samples obtained were 5361.23 ± 854.09, 2567.58 ± 763.61, 808 ± 751.361, 432.29 ± 47.11, 178.36 ± 88.28, 184.58 ± 93.6, 80.89 ± 70.11 and 43.55 ± 32.92 on day 1, 5, 9, 13, 17, 21, 25 and 29 days aged birds respectively. On the other hand, sera samples of group B manifested a titre of 3285.18 ± 685.03, 2219.16 ± 419.77, 1783.62 ± 219.84, 589.01 ± 249.63, 186.66 ± 88.21, 178.36 ± 202.02, 105.77 ± 75.69 and 41.34 ± 69.28 on same schedule. It was further revealed that chicks with ancestor of non-vaccinated parents showed higher MDA titre up to 9th day of age. This might have happened due to exposure of field virus to the parent birds. As regards sero conversion, it was observed that 100, 20 and 80% of serum samples collected from chickens of 0-2 weeks, 3-4 weeks and 4 months of age were positive to IBV specific antibody respectively, whereas no serum sample was positive in case of 5-7 weeks aged birds. When considered the gender of birds, it was revealed that sera from the female showed 58.33% sero positivity against 25% from male. Maternally-derived antibody (MDA) might protect the chickens up to 9 days of age and since MDA could interfere vaccination, it should not be performed before such age.

  Journal
  

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