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Related Experiment Videos

Oligotrophic bacteria isolated from clinical materials

Y Tada1, M Ihmori, J Yamaguchi

  • 1Department of Bacteriology, Kinki University School of Medicine, Osaka, Japan.

Journal of Clinical Microbiology
|February 1, 1995
PubMed
Summary

Oligotrophic bacteria, which thrive in low-nutrient environments, were found in various clinical samples like sputum and drainage. Their presence in routine hospital lab tests was unexpected, and their clinical significance remains unclear.

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Area of Science:

  • Microbiology
  • Clinical Microbiology

Background:

  • Oligotrophic bacteria are microorganisms adapted to environments with extremely low concentrations of organic nutrients.
  • These bacteria have been isolated from diverse sources, including clinical specimens.

Purpose of the Study:

  • To investigate the prevalence and isolation frequency of oligotrophic bacteria from clinical materials.
  • To assess the growth characteristics of isolated oligotrophic bacteria on standard laboratory media.

Main Methods:

  • Collection and analysis of 871 clinical samples.
  • Isolation and identification of bacterial strains.
  • Testing growth on enriched medium, blood agar, and nutrient agar.

Main Results:

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  • Seventy-seven strains of oligotrophic bacteria were isolated from 871 clinical samples.
  • Higher isolation frequencies were observed in drainage, sputum, and throat specimens.
  • Eleven obligate oligotrophic strains exhibited scant growth on common enriched media.

    • Conclusions:

    • Oligotrophic bacteria can be isolated from a range of clinical materials.
    • Their detection was not part of routine hospital laboratory examinations.
    • The clinical significance of these isolated oligotrophic bacteria is currently uncertain.