title: In situ hybridization for the detection of the apxIV gene in the lungs of pigs experimentally infected with twelve Actinobacillus pleuropneumoniae serotypes.
abstract: The detection of the apxlV gene in lung tissues from pigs experimentally infected with the 12 major A. pleuropneumoniae serotype (1 to 12) reference strains was studied by in situ hybridization using a non-radioactive digoxigenin-labeled DNA probe. In situ hybridization produced a distinct positive signal in all pigs inoculated with the 12 A. pleuropneumoniae serotypes. Positive hybridization typically exhibited a dark-brown to black reaction product in intracellular and extracellular locations, without background staining. A strong hybridization signal was seen in degenerated alveolar leukocytes ("oat cells") adjacent to the foci of coagulative necrosis and in the alveolar spaces. The in situ hybridization methodology developed for the detection of the apxIV gene is a valuable tool for the diagnosis of porcine pleuropneumonia caused by A. pleuropneumoniae when only formalin-fixed tissues are submitted for diagnosis.
authors.affiliation: Department of Veterinary Pathology, College of Veterinary Medicine, School of Agricultural Biotechnology, Seoul National University, Suwon 441-744, Kyounggi Do, Republic of Korea.
authors.forename: Wan-Seob
authors.initials: WS
authors.lastname: Cho
authors.forename: Changsun
authors.initials: C
authors.lastname: Choi
authors.forename: Chanhee
authors.initials: C
authors.lastname: Chae
mesh_terms: D000189:Actinobacillus Infections / Q000382:microbiology / Q000473:pathology / Q000662:veterinary*; D016977:Actinobacillus pleuropneumoniae / Q000235:genetics* / Q000302:isolation & purification; D000818:Animals; D001426:Bacterial Proteins / Q000235:genetics*; D015342:DNA Probes; D004269:DNA, Bacterial / Q000032:analysis*; D004076:Digoxigenin; D017403:In Situ Hybridization / Q000379:methods / Q000662:veterinary; D008168:Lung / Q000382:microbiology; D016612:Paraffin Embedding / Q000662:veterinary; D018410:Pneumonia, Bacterial / Q000382:microbiology / Q000473:pathology / Q000662:veterinary*; D011897:Random Allocation; D013552:Swine; D013553:Swine Diseases / Q000382:microbiology* / Q000473:pathology
chemical_list: C122177:ApxIVA protein, Actinobacillus pleuropneumoniae; D001426:Bacterial Proteins; D015342:DNA Probes; D004269:DNA, Bacterial; D004076:Digoxigenin