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Related Concept Videos

Immunofluorescence Microscopy01:12

Immunofluorescence Microscopy

A fluorescence microscope uses fluorescent chromophores called fluorochromes, which can absorb energy from a light source and then emit this energy as visible light. Fluorochromes include naturally fluorescent substances (such as chlorophylls) and fluorescent stains that are added to the specimen to create contrast. Dyes such as Texas red and FITC are examples of fluorochromes. Other examples include the nucleic acid dyes 4’,6’-diamidino-2-phenylindole (DAPI), and acridine orange.
The...

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Detection of Bacteria Using Fluorogenic DNAzymes
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Research: Fluorescence Microscopy-Based Protocol for Detecting Residual Bacteria on Medical Devices.

Michael Wong, Yi Wang, Hao Wang

    Biomedical Instrumentation & Technology
    |December 18, 2020
    PubMed
    Summary

    A new standard operating procedure (SOP) called BAC-VIS uses DAPI stain and fluorescence microscopy to detect residual bacteria on medical devices. This cost-effective method is crucial for ensuring medical device safety and preventing patient infections.

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    Area of Science:

    • Microbiology
    • Medical Device Reprocessing
    • Analytical Chemistry

    Background:

    • Reliable methods are needed to detect bacterial contamination on processed medical devices.
    • Current methods may not be efficient or sensitive enough for residual bacteria detection.
    • Ensuring medical device safety requires robust contamination assessment tools.

    Purpose of the Study:

    • To demonstrate a standard operating procedure (SOP) for fluorescence microscopy-based detection of residual bacteria on medical devices (BAC-VIS).
    • To validate the BAC-VIS protocol for efficiency, signal-to-noise ratio, and application on various medical device components.
    • To assess the utility of BAC-VIS in evaluating the effectiveness of disinfectants and identifying contamination on clinical devices.

    Main Methods:

    • Developed and optimized a standard operating procedure (SOP) named BAC-VIS.
    • Utilized 4',6-diamidino-2-phenylindole (DAPI) stain with fluorescence microscopy for bacterial detection.
    • Validated the protocol on biofilm models, clinically used device channels, and inoculated endoscope components.

    Main Results:

    • Optimized BAC-VIS achieved >80% staining efficiency and a signal-to-noise ratio >20.
    • DAPI-stained cells were detected on all culture-positive clinical devices, particularly in surface imperfections.
    • BAC-VIS successfully detected bacteria on inoculated endoscope components.

    Conclusions:

    • BAC-VIS offers a quick, cost-effective method for detecting residual bacteria on medical devices.
    • The protocol can aid researchers in understanding device design's role in cleanability and contamination.
    • BAC-VIS has the potential to improve medical device safety and patient outcomes by informing design improvements.