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Serological relationship between strains of Pasteurella multocida.

M T Shigidi, A A Mustafa

    The Cornell Veterinarian
    |January 1, 1980
    PubMed
    Summary

    Serological testing of Pasteurella multocida strains revealed close relationships among certain strains and identified specific somatic antigen groups. This research aids in understanding Pasteurella multocida classification and control strategies for hemorrhagic septicemia.

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    Area of Science:

    • Veterinary Microbiology
    • Bacteriology
    • Immunology

    Background:

    • Pasteurella multocida is a significant bacterial pathogen causing various diseases in animals, including hemorrhagic septicemia in cattle.
    • Accurate serological classification is crucial for understanding pathogen diversity and developing effective control measures.

    Purpose of the Study:

    • To determine the serological inter-relationships among 24 strains of Pasteurella multocida.
    • To compare agglutination and gel diffusion tests for their efficacy in Pasteurella multocida serotyping.
    • To investigate the somatic antigen relationships within Pasteurella multocida, particularly in strains associated with cattle hemorrhagic septicemia.

    Main Methods:

    • Agglutination tests were performed on 24 Pasteurella multocida strains (11 reference strains and 13 field isolates from cattle).
    • Gel diffusion tests were employed to corroborate agglutination findings.
    • Analysis focused on serogroup-specific and cross-reactive agglutinating and precipitating properties.

    Main Results:

    • Both agglutination and gel diffusion tests showed agreement, indicating they target the same antigen.
    • While strains exhibited strong serogroup-specific reactions, varying degrees of cross-reactivity were observed.
    • Specific strains (M4, V A3, Kobe 6, R473, 147) demonstrated close serological relationships, suggesting shared somatic antigens. Field isolates predominantly reacted within somatic groups 6, 7, and 8.

    Conclusions:

    • The study successfully elucidated serological relationships within Pasteurella multocida, confirming the utility of both agglutination and gel diffusion assays.
    • Identified close antigenic relationships among specific strains, potentially simplifying future classification efforts.
    • Findings provide valuable insights into the antigenic diversity of Pasteurella multocida relevant to cattle hemorrhagic septicemia.

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