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GASMoC method: a phenol-free technique to detect acid-fast bacilli.

A Gomes1, P Amaral1, R Santos1

  • 1ESTeSL, Escola Superior de Tecnologia da Saúde de Lisboa, Instituto Politécnico de Lisboa, Av. D. João II, Lote 4.69.01, 1990-096, Lisbon, Portugal.

Histochemistry and Cell Biology
|October 27, 2019
PubMed
Summary
This summary is machine-generated.

A new phenol-free method, GASMoC, effectively detects acid-fast bacilli (AFB) in mycobacteria, matching the Ziehl-Neelsen technique (ZNT) performance. This safer alternative simplifies microscopic inspection for pathology labs.

Keywords:
Aqueous basic fuchsineCarbol-fuchsineModified Ziehl–Neelsen techniqueMycobacteria detectionMycobacterium tuberculosisSafe acid-fast bacilli detection

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Area of Science:

  • Microbiology
  • Histochemistry
  • Pathology

Background:

  • Mycobacterium species, including M. tuberculosis, are significant pathogens requiring accurate laboratory detection.
  • The Ziehl-Neelsen technique (ZNT) is a standard histochemical method for identifying acid-fast bacilli (AFB).
  • The role of phenol in ZNT is unclear, and its toxicity raises concerns, prompting investigation into phenol-free alternatives.

Purpose of the Study:

  • To evaluate the diagnostic capacity of a modified Ziehl-Neelsen technique (GASMoC) that excludes phenol.
  • To compare the mycobacterial detection ability of the GASMoC method with the conventional ZNT.

Main Methods:

  • The GASMoC method, a modified Ziehl-Neelsen technique, utilizes heated aqueous basic fuchsin at 37°C without phenol.
  • Histological samples previously identified as positive for mycobacteria were tested using both GASMoC and ZNT.

Main Results:

  • The GASMoC method successfully detected acid-fast bacilli (AFB) in all tested mycobacterial samples.
  • Microscopic visualization of mycobacteria was reportedly easier using the GASMoC method compared to ZNT.
  • The study confirmed that phenol is not essential for the effective detection of AFB.

Conclusions:

  • The GASMoC method demonstrates comparable efficacy to the Ziehl-Neelsen technique for AFB detection.
  • This phenol-free approach offers a safer and potentially more efficient alternative for pathology laboratories.
  • The GASMoC method can serve as a viable substitute for the ZNT in routine mycobacterial diagnostics.