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Selective medium for Moraxella nonliquefaciens.

O P van Bijsterveld, K C Winkler

    Applied Microbiology
    |February 1, 1970
    PubMed
    Summary
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    This study introduces a novel selective medium that effectively isolates Moraxella species from the conjunctiva and upper respiratory tract. The new medium significantly enhances the detection of Moraxella nonliquefaciens compared to existing methods.

    Area of Science:

    • Microbiology
    • Bacterial Isolation
    • Ophthalmology

    Background:

    • The normal flora of the conjunctiva and upper respiratory tract contains numerous bacteria that can hinder the isolation of specific pathogens.
    • Moraxella species, including Moraxella nonliquefaciens, Moraxella liquefaciens, and less fastidious strains of Moraxella lacunata, are of clinical interest in ocular and respiratory infections.
    • Accurate and efficient isolation of Moraxella species is crucial for diagnosis and treatment.

    Purpose of the Study:

    • To develop and describe a new selective culture medium for the enhanced isolation of Moraxella species.
    • To inhibit the growth of common bacteria found in the conjunctiva and upper respiratory tract flora.
    • To improve the detection rate of Moraxella nonliquefaciens.

    Main Methods:

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    • Development of a selective culture medium incorporating specific inhibitors: thiostrepton, tyrothricin, and sodium nalidixinate.
    • Optimization of incubation conditions, including increased carbon dioxide (CO2) pressure.
    • Comparison of isolation rates of Moraxella species on the new selective medium versus conventional media.

    Main Results:

    • The selective medium successfully inhibited the growth of most bacteria from the normal flora of the conjunctiva, lid-margin, and upper respiratory tract.
    • The medium permitted the growth of Moraxella nonliquefaciens, M. liquefaciens, and less fastidious strains of M. lacunata.
    • Incubation under increased CO2 pressure significantly improved the number of primary isolations.
    • Moraxella nonliquefaciens was isolated twice as frequently on the selective medium compared to other tested media.

    Conclusions:

    • The described selective medium provides an effective method for isolating Moraxella species, particularly Moraxella nonliquefaciens.
    • The use of thiostrepton, tyrothricin, and sodium nalidixinate as selective agents, combined with increased CO2 pressure, enhances diagnostic yield.
    • This novel medium represents a valuable tool for clinical microbiology laboratories studying ocular and respiratory infections.