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Bacteriophage typing scheme for Salmonella infantis.

S Kasatiya, T Caprioli, S Champoux

    Journal of Clinical Microbiology
    |November 1, 1979
    PubMed
    Summary

    A new bacteriophage typing system effectively classified 546 Salmonella infantis strains into 23 types. This system aids in tracking the spread of Salmonella infantis infections across various sources.

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    Area of Science:

    • Microbiology
    • Epidemiology
    • Infectious Diseases

    Background:

    • Salmonella infantis is a significant foodborne pathogen.
    • Accurate identification and subtyping are crucial for epidemiological surveillance.
    • Existing typing methods may have limitations in Salmonella infantis differentiation.

    Purpose of the Study:

    • To develop and validate a novel bacteriophage typing system for Salmonella infantis.
    • To establish a robust method for differentiating Salmonella infantis strains.
    • To facilitate the epidemiological investigation of Salmonella infantis outbreaks.

    Main Methods:

    • Selection of nine bacteriophages (three from sewage, six from human feces).
    • Application of the selected phages to a collection of 546 Salmonella infantis strains.
    • Classification of strains into distinct phage types based on susceptibility patterns.

    Main Results:

    • A typing system was established, classifying all but 7 of 546 strains into 23 distinct phage types.
    • The five most prevalent phage types accounted for 66% of all isolates.
    • Strains from diverse sources (humans, animals, food, water) and different time points consistently belonged to the same phage type.

    Conclusions:

    • The developed bacteriophage typing system is effective for Salmonella infantis.
    • This system provides a valuable tool for tracing the source and spread of Salmonella infantis.
    • The phage typing results demonstrate the epidemiological linkage of strains across different sources and time intervals.

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