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Related Experiment Videos

Techniques for isolating thermotolerant and pathogenic freeliving amebae

D T John1, M J Howard

  • 1Department of Biochemistry and Microbiology, Oklahoma State University, College of Osteopathic Medicine, Tulsa 74107, USA.

Folia Parasitologica
|January 1, 1996
PubMed
Summary

This study found that swab samples and incubation at 42°C are optimal for isolating thermotolerant and pathogenic freeliving amebae, including Acanthamoeba and Naegleria species.

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Area of Science:

  • Environmental microbiology
  • Parasitology
  • Microbial ecology

Background:

  • Free-living amebae (FLA) are ubiquitous microorganisms found in various environments.
  • Some FLA species, such as Acanthamoeba and Naegleria fowleri, are pathogenic to humans.
  • Efficient isolation methods are crucial for studying FLA and preventing infections.

Purpose of the Study:

  • To determine optimal conditions for isolating thermotolerant and pathogenic freeliving amebae.
  • To compare the efficacy of different sample types (swabs vs. water) and volumes.
  • To identify the most effective incubation temperature for thermotolerant FLA.

Main Methods:

  • Evaluation of various isolation conditions for thermotolerant and pathogenic FLA.
  • Comparison of swab samples versus water samples for pathogenic FLA isolation.

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  • Assessment of different water sample volumes (e.g., 50-ml).
  • Incubation at 42°C to identify thermotolerant FLA.

    • Main Results:

    • Swab samples yielded more pathogenic FLA than water samples.
    • For water samples, a 50-ml volume provided the highest percentage of pathogenic isolates.
    • Incubation at 42°C maximized the recovery of thermotolerant FLA.
    • Eleven pathogenic FLA isolates were obtained from 762 environmental samples: Acanthamoeba (55%), Naegleria fowleri (27%), and N. australiensis (18%).

    Conclusions:

    • Swab sampling and incubation at 42°C are recommended for isolating thermotolerant and pathogenic FLA.
    • Specific protocols, including sample volume, can enhance the detection of pathogenic FLA like Naegleria species.
    • This research contributes to understanding FLA ecology and improving diagnostic and public health strategies.