Comparative evaluation of outer membrane protein and whole cell antigen vaccine against avian pathogen Escherichia coli infection in broiler chicken
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 Escherichia coli in broiler chickens.
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 Escherichia coli O2 infection in broiler chickens. Birds vaccinated with OMP exhibited fewer pathological lesions and a stronger immune response. The findings underscore the potential of OMP-based vaccines as a safer, more immunogenic alternative for controlling colibacillosis.
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| Files | ||
| Issue | Vol 18 No 1 (2026) | |
| Section | Original Article(s) | |
| DOI | https://doi.org/10.18502/ijm.v18i1.20935 | |
| Keywords | ||
| Escherichia coli Colibacillosis Chickens Bacterial outer membrane proteins Vaccines Immune response | ||
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