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Differentiation between Viable and Dead Cryptosporidium Oocysts Using Fluorochrome Staining.

Tatsuya Tomonaga1, Shiba Kumar Rai2, Shoji Uga3

  • 1Department of Microbiology and Infectious Disease, Kobe University Graduate School of Medicine, Kobe 654-0142, Japan.

The Kobe Journal of Medical Sciences
|July 2, 2016
PubMed
Summary

The fluorogenic nucleic acid dye SYTO-17 effectively distinguishes live from dead Cryptosporidium oocysts. This method offers high sensitivity for detecting dead oocysts, aiding in parasite viability assessment.

Keywords:
Cryptosporidium oocystDifferentiationNucleic acid stainingSYTO-17Viable

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Area of Science:

  • Parasitology
  • Microbiology
  • Molecular Biology

Background:

  • Cryptosporidium oocysts are a significant cause of waterborne illness.
  • Accurate differentiation between viable and dead oocysts is crucial for water quality assessment and outbreak investigations.
  • Current methods for oocyst viability assessment can be labor-intensive and may lack sensitivity.

Purpose of the Study:

  • To evaluate the efficacy of fluorochrome nucleic acid dyes for differentiating viable and dead Cryptosporidium oocysts.
  • To identify the optimal dye and staining conditions for accurate viability assessment.
  • To establish a reliable method for discriminating between live and dead oocysts.

Main Methods:

  • Seven fluorochrome nucleic acid dyes, including SYTO-17 and SYTO-59, were tested.
  • Dyes were assessed for specificity (unstained viable oocysts) and sensitivity (stained dead oocysts).
  • Optimal staining time, dye concentration, and temperature (37°C) were determined for SYTO-17.

Main Results:

  • SYTO-17 and SYTO-59 showed high sensitivity (average 91%) in staining dead oocysts.
  • SYTO-17 exhibited superior brightness and stability, with optimal staining achieved after one hour at 37°C (96% sensitivity).
  • Maximal color intensity was observed at 20-30 µM SYTO-17 concentrations, with no further improvement at higher concentrations.

Conclusions:

  • The fluorogenic nucleic acid dye SYTO-17 is a reliable tool for discriminating between live and dead Cryptosporidium oocysts.
  • SYTO-17 offers a sensitive and specific method for oocyst viability assessment.
  • This technique can enhance the accuracy of Cryptosporidium monitoring in environmental and clinical settings.