ArticleIranian journal of microbiology2026
Comparative evaluation of outer membrane protein and whole cell antigen vaccine against avian pathogen
Article in Iranian journal of microbiology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background and Objectives: Present study was aimed at assessing protective efficacy of outer membrane protein (OMP) vaccine in comparison to inactivated whole cell antigen vaccine after challenge with homologous serogroup (O2) of avian pathogenic Materials and Methods: The outer membrane proteins were extracted by sarcosyl method and protein concentration was determined by nanodrop spectrophotometer. The study comprised of 120 birds divided into 6 groups. The birds were subcutaneously immunized twice with primary vaccine in the first week followed by booster vaccine in second week. Results: The protection rate of 82% was found in whole cell inactivated antigen, 91% in OMP vaccine and 27% among the unvaccinated group. The antibody (IgG) response was found significantly higher in OMP vaccine group than whole cell antigen group. In unvaccinated groups chicks, the antibody titer never reached to the protective level till the termination of experiment. The bacteria were re-isolated from the infected broiler chickens for the confirmation of induced infection and were characterized using standard cultural and biochemical tests belonging to O2 serogroup. Conclusion: Our study demonstrated that the outer membrane protein (OMP) vaccine provided significantly higher protection (91%) and antibody response compared to the inactivated whole cell antigen vaccine (82%) against
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