title: Improved protection of swine from pleuropneumonia by vaccination with proteinase K-treated outer membrane of Actinobacillus (Haemophilus) pleuropneumoniae.
abstract: The immunogenic and protective potentials of an outer membrane-enriched fraction (OM) from a serotype 5 strain of Actinobacillus (Haemophilus) pleuropneumoniae (APP) and the same OM degraded with proteinase K or periodate were evaluated in swine. Groups of pigs were vaccinated with two doses of OM, proteinase K-treated OM (P-OM), periodate-treated OM (PI-OM), or placebo vaccine and challenged intranasally with the homologous strain of APP. Results from triplicate experiments indicated that proteinase K treatment of OM resulted in an improved efficacy. This improved efficacy of P-OM vaccine over untreated OM vaccine was evidenced not only by less severe lung lesions in P-OM vaccinated pigs but also by significant reduction (P less than 0.05) in the number of P-OM vaccinated pigs which developed lung lesions upon challenge with APP. Assessment of sera from vaccinated animals by immunoblotting, complement fixation test, or ELISA indicated that the immunogenicity of some but not all protein or carbohydrate components were reduced (or eliminated) by proteinase K and periodate treatments respectively.
authors.affiliation: Veterinary Medical Research Institute, College of Veterinary Medicine, Iowa State University, Ames 50011.
authors.forename: Y W
authors.initials: YW
authors.lastname: Chiang
authors.forename: T F
authors.initials: TF
authors.lastname: Young
authors.forename: V J
authors.initials: VJ
authors.lastname: Rapp-Gabrielson
authors.forename: R F
authors.initials: RF
authors.lastname: Ross
mesh_terms: D000188:Actinobacillus / Q000276:immunology*; D000189:Actinobacillus Infections / Q000517:prevention & control / Q000662:veterinary*; D000818:Animals; D000907:Antibodies, Bacterial / Q000096:biosynthesis; D000942:Antigens, Bacterial / Q000276:immunology; D001425:Bacterial Outer Membrane Proteins / Q000276:immunology; D003168:Complement Fixation Tests; D004591:Electrophoresis, Polyacrylamide Gel; D019286:Endopeptidase K; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006190:Haemophilus / Q000276:immunology; D006192:Haemophilus Infections / Q000517:prevention & control / Q000662:veterinary; D008297:Male; D011001:Pleuropneumonia / Q000517:prevention & control / Q000662:veterinary*; D011897:Random Allocation; D012697:Serine Endopeptidases / Q000378:metabolism; D013552:Swine; D013553:Swine Diseases / Q000517:prevention & control*; D014611:Vaccination / Q000662:veterinary*
chemical_list: D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial; D001425:Bacterial Outer Membrane Proteins; D012697:Serine Endopeptidases; D019286:Endopeptidase K