acid-fast

(redirected from Acid-fast organism)
Also found in: Dictionary, Thesaurus.

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 ?
(19,20) Ingested, nonpathogenic acid-fast organisms may also be found in the feces.
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.
Microscopic findings: The consistent histologic findings in all cases were diffuse granulomas characterized by extensive foamy poorly basophilic macrophages, epithelioid cells and lymphocytes infiltration into the mucosa and submucosa of the small intestine with numerous acid-fast organisms (figure 2a).
Birds were considered cured if no macroscopic or microscopic lesions consistent with active mycobacteriosis were identified in any organ; the liver, spleen, and bone marrow were culture and PCR negative; and acid-fast organisms were not seen in Ziehl-Neelsen-stained sections in any organ.
Massive numbers of acid-fast organisms were observed in these lesions.
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.
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.
Cryptosporidium oocysts exhibit acid-fast staining and must be differentiated from partially acid-fast organisms including Cyclospora cayetanensis [2].