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Capsular serotypes of Rhodococcus equi

M D Mutimer, J F Prescott, J B Woolcock

    Australian Veterinary Journal
    |February 1, 1982
    PubMed
    Summary
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    This study analyzed 100 Rhodococcus equi strains from Australia, finding most fit existing serotypes, with serotype 1 being most common. Serotypes were consistent across various animal sources and soil, regardless of origin.

    Area of Science:

    • Veterinary Microbiology
    • Bacterial Pathogenesis
    • Animal Health

    Background:

    • Rhodococcus equi is an important cause of pneumonia in foals.
    • Understanding the diversity and distribution of R. equi serotypes is crucial for disease control.
    • Previous studies have characterized R. equi serotypes, but comprehensive Australian data is limited.

    Purpose of the Study:

    • To determine the capsular serotype distribution of Rhodococcus equi strains from various animal species and environmental sources in Australia.
    • To investigate potential relationships between capsular serotype and the source of origin of R. equi isolates.

    Main Methods:

    • Serotyping of 100 Rhodococcus equi isolates using established methods.
    • Collection of isolates from diverse animal hosts (horses, cattle, pigs, etc.) and environmental sources (soil).

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  • Comparison of serotype data with isolate source information.

    • Main Results:

    • Eighty-four percent of the 100 Australian Rhodococcus equi strains belonged to the 7 recognized capsular serotypes.
    • Serotype 1 was the most prevalent, accounting for just under half of all strains examined.
    • Isolates from various animal intestines, feces, and soil shared serotypes with those causing foal pneumonia.

    Conclusions:

    • The capsular serotypes of Rhodococcus equi in Australia are consistent across different animal species and environmental sources.
    • There is no clear association between capsular serotype and the origin of Rhodococcus equi isolates.
    • Findings suggest a broad distribution of common R. equi serotypes relevant to animal health in Australia.