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In Process Quality Control Factors Affecting The Potency Of Indigenous Mycoplasma Gallisepticum (Mg)

By: Muhammad Asim Raza | Dr. Arfan Ahmad.
Contributor(s): Prof. Dr. Masood Rabbani.
Material type: materialTypeLabelBookPublisher: 2012Subject(s): Department of MicrobiologyDDC classification: 1495,T Dissertation note: Mycoplasma gallisepticum (MG) is cause of chronic respiratory disease (CRD) and is responsible for significant economic losses to poultry industry. In Pakistan, imported MG bacterin fails to induce immunoprophylaxis that could be due to subtle antigenic variation in the immunogen of the vaccine. Therefore present study was conducted to optimize inactivations( phenol, formalin and binary ethylenimine) concentration and exposure time to inactivate MG and their effect on potency of MG bacterin ( prepared from local isolates) along with different bacterial biomasses (0.5%, 1% and 1.5% PCV) and adjuvants (montanide oil ,gel and water ). It was observed that the MG bacterin containing 1.5% level of immunogen/biomass induced significantly higher anti-MG-ELISA antibody titer (p < 0.05) as compared to other bacterins containing lower concentrations of the immunogen.The formaldehyde inactivated the pathogen within shortest possible time and showed undetectable effect on its potency. The antibody response was significantly higher (p<0.05) as compared to that of bacterins prepared from the pathogens inactivated by either phenol or BEI. . Montanide ISA70 containing MG bacterin induced significantly higher anti-MG-ELISA antibody titer (p<0.05) in broilers than the other bacterins containing either water or aluminum hydroxide gel. It is concluded that formaldehyde inactivated oil based vaccine containing one percent immunogen (0ne percent PCV) induce antibody response in broilers that is comparable with the imported vaccine.
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Mycoplasma gallisepticum (MG) is cause of chronic respiratory disease (CRD) and is responsible for significant economic losses to poultry industry. In Pakistan, imported MG bacterin fails to induce immunoprophylaxis that could be due to subtle antigenic variation in the immunogen of the vaccine. Therefore present study was conducted to optimize inactivations( phenol, formalin and binary ethylenimine) concentration and exposure time to inactivate MG and their effect on potency of MG bacterin ( prepared from local isolates) along with different bacterial biomasses (0.5%, 1% and 1.5% PCV) and adjuvants (montanide oil ,gel and water ). It was observed that the MG bacterin containing 1.5% level of immunogen/biomass induced significantly higher anti-MG-ELISA antibody titer (p < 0.05) as compared to other bacterins containing lower concentrations of the immunogen.The formaldehyde inactivated the pathogen within shortest possible time and showed undetectable effect on its potency. The antibody response was significantly higher (p<0.05) as compared to that of bacterins prepared from the pathogens inactivated by either phenol or BEI. . Montanide ISA70 containing MG bacterin induced significantly higher anti-MG-ELISA antibody titer (p<0.05) in broilers than the other bacterins containing either water or aluminum hydroxide gel. It is concluded that formaldehyde inactivated oil based vaccine containing one percent immunogen (0ne percent PCV) induce antibody response in broilers that is comparable with the imported vaccine.

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