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  • Title: Actinobacillus (Haemophilus) pleuropneumoniae serotype-8 isolates and their antigenic relationships with other A pleuropneumoniae serotypes.
    Author: Mittal KR, Higgins R, Larivière S.
    Journal: Am J Vet Res; 1989 Feb; 50(2):259-62. PubMed ID: 2470278.
    Abstract:
    Antigenic relationship of Actinobacillus (Haemophilus) pleuropneumoniae serotype-8 isolates with other serotypes was studied, using tube agglutination, with and without 2-mercaptoethanol, indirect hemagglutination with and without 2-mercaptoethanol, ring precipitation, coagglutination, and immunodiffusion tests. Serotype-8 isolates possessed serotype-specific, group-specific common antigens cross-reactive with serotypes 3 and 6 and species-specific common antigens cross-reactive with other serotypes. Absorption studies were done to study the antigenic relationship of serotype 8 with serotypes 3 and 6. Rabbit antisera against whole-cell (WC) suspensions of reference strains of serotypes 3, 6, and 8 were used for absorption studies with WC and boiled WC suspensions of homologous and heterologous serotypes. Unabsorbed and absorbed sera were tested for antibodies against WC and boiled WC antigen preparations of serotype 8, using various serotests. Absorption studies revealed that serotype-8 strains possessed 2 main types of epitopes, one of which was serotype-specific and did not have cross-reactivity with other serotypes. The second type of epitopes was group specific and was cross-reactive with serotypes 3 and 6.
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