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A cold staining method for acid-fast bacilli.

R Vasanthakumari, K Jagannath, S Rajasekaran

    Bulletin of the World Health Organization
    |January 1, 1986
    PubMed
    Summary
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    A new cold staining technique offers a reliable alternative to the Ziehl-Neelsen method for identifying tubercle bacilli, especially in resource-limited settings. This method ensures accurate results without the need for controlled heating or difficult-to-obtain rectified spirit.

    Area of Science:

    • Microbiology
    • Medical Laboratory Science

    Background:

    • The Ziehl-Neelsen method is a standard for staining tubercle bacilli but requires controlled heating.
    • Access to rectified spirit for heating is a challenge in many developing countries, hindering the Ziehl-Neelsen procedure.
    • Spirit lamps are common heat sources in laboratories in developing nations, but are insufficient for the Ziehl-Neelsen method.

    Purpose of the Study:

    • To describe a novel cold staining technique for identifying tubercle bacilli.
    • To evaluate the efficacy of this cold staining method as an alternative to the conventional Ziehl-Neelsen procedure.
    • To provide a viable staining method for laboratories with basic equipment.

    Main Methods:

    • A cold staining technique was developed using the same staining solutions as the Ziehl-Neelsen method.

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  • The cold staining procedure was applied to both direct and concentrated smears.
  • Results from the cold staining method were compared against the conventional Ziehl-Neelsen method.

    • Main Results:

    • The cold staining technique demonstrated high correlation with the Ziehl-Neelsen method.
    • Correlation for direct smears was 97%.
    • Correlation for concentrated smears reached 99%.

    Conclusions:

    • The described cold staining technique is a suitable and effective alternative to the Ziehl-Neelsen method.
    • This method is particularly valuable for laboratories in developing countries with limited resources.
    • Accurate identification of tubercle bacilli is achievable with basic laboratory equipment using this cold staining approach.