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Sewage coliphages studied by electron microscopy.

H W Ackermann, T M Nguyen

    Applied and Environmental Microbiology
    |March 1, 1983
    PubMed
    Summary
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    Electron microscopy identified thirteen types of Escherichia coli phages in sewage, including T-even types. This technique is crucial for understanding phage distribution and ecology worldwide.

    Area of Science:

    • Microbiology
    • Virology
    • Environmental Science

    Background:

    • Escherichia coli (E. coli) are common bacteria found in sewage.
    • Bacteriophages (phages) are viruses that infect bacteria and play roles in microbial ecology.
    • Understanding phage populations in wastewater is important for public health and environmental monitoring.

    Purpose of the Study:

    • To identify and characterize bacteriophages infecting E. coli strains isolated from sewage.
    • To assess the utility of electron microscopy for phage identification and ecological studies.

    Main Methods:

    • Sewage was enriched with 35 E. coli strains.
    • Sediments from enrichment cultures were examined using electron microscopy.
    • Phages were identified based on their morphology and classified into families and species.

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    Main Results:

    • Electron microscopy revealed up to 10 morphologically distinct particles per sample.
    • T-even type phages were predominant in 14 samples.
    • Thirteen specific phage types were enriched and identified, belonging to Myoviridae, Styloviridae, Podoviridae, and Microviridae families. Twelve matched known enterobacterial phage species.
    • Phage types 121 and 9266, previously found only in Romania and South Africa, were detected.

    Conclusions:

    • Electron microscopy is a valuable tool for identifying bacteriophages in environmental samples.
    • The study identified diverse E. coli phages in sewage, contributing to knowledge of phage geography and ecology.
    • Further research using this technique can enhance understanding of phage-host interactions in wastewater environments.