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Evaluation of systemic and mucosal immune responses in mice administered with novel recombinant Salmonella vaccines for avian pathogenic Esherichia coli

  • Oh, In-Gyeong (College of Veterinary Medicine and Bio-Safety Research Institute, Chonbuk National University) ;
  • Lee, John Hwa (College of Veterinary Medicine and Bio-Safety Research Institute, Chonbuk National University)
  • Received : 2013.01.04
  • Accepted : 2013.06.21
  • Published : 2013.12.31

Abstract

Avian pathogenic Escherichia coli (APEC) is a causative agent for a number of extra intestinal diseases and account for significant losses to the poultry industry. Since protective immunity against APEC is largely directed to virulence antigens, we have individually expressed four different viulence antigens, papA, papG, IutA, and CS31A, using an attenuated Salmonella Typhimurium and a plasmid pBB244. Following oral immunization of mice with combination of two or four of these strains, serum IgG and mucosal IgA responses were elicited against each antigen represented in the mixture. The antigen-specific mucosal IgA responses were significantly higher in the group of mice immunized with the heat-labile Escherichia coli enterotoxin B subunit (LTB) strain than those in the group of mice immunized without the LTB strain. While, there was no significant difference between these two groups in antigen-specific serum IgG responses. The results showed that LTB could act as mucosal immune adjuvant. To assess the nature of immunity, the distribution of antigen-specific IgG isotypes was analyzed. All groups promoted Th1-type immunity as determined by the IgG2a/IgG1 ratio. Thus, our findings provided evidence that immunization with a combination of several vaccine strains is one of the strategies of developing effective vaccines against APEC.

Keywords

References

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