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. 1992 Aug;60(8):3042–3051. doi: 10.1128/iai.60.8.3042-3051.1992

Preparation, characterization, and immunogenicity of conjugate vaccines directed against Actinobacillus pleuropneumoniae virulence determinants.

W Byrd 1, S Kadis 1
PMCID: PMC257279  PMID: 1639471

Abstract

Conjugate vaccines were prepared in an attempt to protect pigs against swine pleuropneumonia induced by Actinobacillus pleuropneumoniae (SPAP). Two subunit conjugates were prepared by coupling the A. pleuropneumoniae 4074 serotype 1 capsular polysaccharide (CP) to the hemolysin protein (HP) and the lipopolysaccharide (LPS) to the HP. Adipic acid dihydrazide was used as a spacer to facilitate the conjugation in a carbodiimide-mediated reaction. The CP and the LPS were found to be covalently coupled to the HP in the conjugates as determined by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and detergent gel chromatography analyses. Following a booster vaccination, pigs exhibited significantly high (P less than 0.05) immunoglobulin G antibodies against CP, LPS, and HP. The anti-CP and anti-LPS immunoglobulin G antibodies were found to function as opsonins in the phagocytosis of A. pleuropneumoniae by polymorphonuclear leukocytes, whereas antibodies to the HP neutralized the cytotoxic effect of the HP on polymorphonuclear leukocytes. No killing of A. pleuropneumoniae was observed when the effects of the antibodies were tested in the presence of complement. Thus, polysaccharide-protein A. pleuropneumoniae conjugates elicit significant antibody responses against each component of each conjugate, which could be instrumental in protecting swine against SPAP.

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Selected References

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