acid-fast

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acid-fast

 [as´id-fast]
not readily decolorized by acids after staining; said of bacteria, especially Mycobacterium tuberculosis.

ac·id-fast

(as'id-fast),
Denoting bacteria that are not decolorized by acid-alcohol after having been stained with dyes such as basic fuchsin; for example, the mycobacteria and nocardiae.

acid-fast

(as´id-fast) not readily decolorized by acids after staining.

acid-fast

(ăs′ĭd-făst′)
adj.
Not decolorized by acid after staining, as bacteria that retain dye after an acid rinse.

ac′id-fast′ness n.

ac·id-fast

(as'id-fast)
Denoting bacteria that are not decolorized by acid-alcohol after having been stained with dyes such as basic fuchsin; e.g., the mycobacteria and a few nocardiae.

acid-fast

bacteria that retain acidic microbiological stains

ac·id-fast

(as'id-fast)
Denoting bacteria that are not decolorized by acid-alcohol after having been stained with dyes such as basic fuchsin.

acid-fast

1. not readily decolorized by acids after staining; said of bacteria, especially Mycobacterium spp.
2. stain demonstrating this characteristic. See also Ziehl-Neelsen stain.

modified acid-fast bacteria
resist decolorization by mild acid solutions; includes Brucella and Nocardia.
References in periodicals archive ?
In both cases, death was attributed to mycobacteriosis based on the presence of severe granulomatous inflammatory lesions in the liver, spleen, and lungs and the identification of acid-fast organisms.
Microscopic examination of liver and spleen confirmed mycobacteriosis in both birds based on the presence of granulomatous inflammation, moderate to massive numbers of acid-fast organisms, positive culture results, and results of PCR testing.
Acid-fast organisms (few to massive numbers) were usually completely restricted to the central core of necrosis observed in the granulomatous foci of the spleen (Fig 1 b), liver, lungs, and ovary.
Acid-fast organisms were only identified in 1 bird in liver biopsy samples.
Acid-fast organisms were not observed in Ziehl-Neelsen-stained sections.
19,20) Ingested, nonpathogenic acid-fast organisms may also be found in the feces.
24) Additionally, in many cases, even though acid-fast organisms are present in the tissues, they cannot be grown.
Criteria for the classification of the birds based on infection status were based on the positive identification of mycobacteria by culture or PCR or identification of acid-fast organisms in stained tissues or smears.
Also, acid-fast organisms were not evenly distributed in examined ZN-stained sections of liver and other organs, suggesting that micro-organisms may not have been present in the small sections of tissue from where DNA was extracted.