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

(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.

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.
References in periodicals archive ?
Slit-skin smear from the earlobe did not reveal acid-fast bacilli.
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.[5]
Although formalin-induced autofluorescence and acid-fast stain of CLCs are probably nonspecific phenomena, use of the fluorescent microscope and the Ziehl-Neelsen stain can successfully help in the diagnosis of acute-phase EC, especially in samples with massive tissue necrosis.
No acid-fast bacilli were noted on Ziehl-Neelsen staining.
In summary, the diagnosis of cutaneous tuberculosis is based on clinical features, demonstration of acid-fast bacilli on smear, tissue culture, skin biopsy, and in recent years, PCR.
Applicants with chest radiographs suggestive of tuberculosis now are required to submit three sputum specimens for both sputum smears for acid-fast microscopy and mycobacterial culture.
Smears stained with ZN stain (Figure 2: Acid-fast bacilli in ZN stain, 100 X.) were examined under oil immersion objective for AFB.
In this nonrandom sample of 26 TB outbreaks in the United States during 2002-2011, we found that characteristics common among TB cases that started outbreaks included pulmonary TB smear-positive for acid-fast bacilli, patient substance abuse, and prolonged infectious periods.
Disseminated histiocytic infiltration of either aggregates or sheets of epithelioid cells containing acid-fast bacilli, in the absence of caseous necrosis, were observed in different organs of the infected doves, especially lungs (23/23), intestines (9/23).
staining was performed on unfixed slide after heat fixing for acid-fast bacilli.