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Ziehl-Neelsen Kit

Acid-Fast Bacteria Stain โ€” TB & Mycobacteria

Acid-Fast Bacteria Kit

Ziehl-Neelsen Acid-Fast Stain Kit

WHO-Standard TB Diagnostic Grade โ€” Supplied by Delonix Enterprise

The Ziehl-Neelsen (ZN) stain is the gold standard method for detecting acid-fast bacteria (AFB), particularly Mycobacterium tuberculosis, in clinical specimens. This differential stain exploits the unique waxy cell walls of mycobacteria that contain mycolic acids, making them resistant to decolorization by acid-alcohol after staining with carbol fuchsin. The kit produces distinct red acid-fast bacilli against a blue background, allowing rapid screening for tuberculosis and other mycobacterial infections. Essential for microbiology laboratories, pathology departments, and TB diagnostic centers. The method can be applied to tissue sections, sputum smears, and other clinical specimens.

Stain Type
Acid-Fast Bacteria (AFB)
Target
Mycobacterium species (TB, leprosy), Nocardia
Mechanism
Carbol fuchsin retention despite acid-alcohol decolorization
Applications
TB diagnosis, tissue granulomas, sputum smears, lymph node biopsies
Results
Acid-fast bacteria: Red | Background: Blue | Other bacteria: Blue
Kit Includes
Carbol fuchsin, acid-alcohol decolorizer, methylene blue counterstain
๐Ÿ’ก Standard method for TB diagnosis in resource-limited settings. For atypical mycobacteria or when false negatives suspected, use fluorochrome methods (Auramine-Rhodamine) for increased sensitivity.
Staining Characteristics

Ziehl-Neelsen Results

1

Acid-Fast Bacilli

Stain bright red or pinkish-red. Rod-shaped bacteria may appear singly, in clusters, or in "schooling" patterns. Mycolic acid cell walls retain carbol fuchsin.

2

Background Elements

Nuclei and non-acid-fast bacteria stain blue with methylene blue counterstain. Provides clear contrast for AFB identification.

3

Modified ZN (Fite)

Weaker acid decolorization for demonstrating M. leprae in tissue sections and other less acid-fast organisms.

4

Clinical Applications

Essential for TB diagnosis, leprosy identification, and detecting atypical mycobacteria in immunocompromised patients.

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