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Not decolorized by acid after staining, as bacteria that retain dye after an acid rinse.

ac′id-fast′ness n.


(Microbiology) (of bacteria and tissues) resistant to decolorization by mineral acids after staining


resistant to decolorizing by acidified alcohol after staining.
ac′id-fast`ness, n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.acid-fast - not easily decolorized by acid solutions; pertains to micro-organisms (especially the tubercle bacillus that causes tuberculosis)
imperviable, impervious - not admitting of passage or capable of being affected; "a material impervious to water"; "someone impervious to argument"
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References in periodicals archive ?
Fite staining confirmed their cytoplasmic content of abundant and focally clumped acid-fast bacilli.
A cytological sample of the liver obtained through a fine needle aspirate revealed intracellular acid-fast bacilli identified as Mycobacterium avium.
The chances of acid-fast bacilli (AFB) identification in tissue section are less because xylene and formalin affect the sensitivity of Ziehl-Neelsen (ZN) method to detect Mycobacterium tuberculosis in histopathology sections.
The broncho-alveolar lavage [BAL] was negative for gram-stain and acid-fast bacilli and few macrophages were seen on cytology.
Slit-skin smear revealed multiple acid-fast bacilli (AFB) on Wade-Fite staining, thus confirming the diagnosis of lepromatous leprosy.
Comparison of fluorescence microscopy with Ziehl-Neelsen stain for demonstration of acid-fast bacilli in smear preparations and tissue sections.
Acid-fast bacilli were seen prominently inside the blood vessels (endothelium) and on the subcutaneous fat in Fite-Farraco staining (Figure 5B).
Slit skin smear examination from six sites (right and left ear lobules, right and left sides of nose, and from any two lesions) revealed positive findings for acid-fast bacilli with bacteriological index of 2.
Only one-third of the patients showed a positive direct Ziehl-Neelsen stain for acid-fast bacilli and half had a positive culture.
To the Editor: Nocardia species are Gram-positive partially acid-fast Bacilli that are found in soil and water.