acid fast


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Related to acid fast: Acid fast bacilli

acid fast

Of a stained tissue or organism, retaining the stain even in the presence of acid. Acid-fastness is a feature of certain organisms, such as the tubercle bacillus Mycobacterium tuberculosis , that have wax and fat in their cell walls. The fact is used as an aid to identification.
References in periodicals archive ?
Microscopic examination showed 04 acid fast bacilli / 100 fields, histopathology revealed chronic granulomatous inflammation with necrosis and there was no evidence of malignancy.
Either an acid fast culture was not sent from the bronchoalveolar washings or its results never came out at the Health Dept.
The objective of this study was to detect and confirm the presence of acid fast bacilli in lymph node biopsies using routine Ziehl Neelsen stain, Kinyoun stain and fluorescence staining and also to determine the best, rapid and more cost effective technique of staining for the detection of acid fast bacilli.
An unusual acid fast infection of the knee with subcutaneous, abscess-like lesions of the gluteal region: report of a case study with a study of the organism, Mycobacterium abscessus.
In the first stage we determined the positive cut-off point for ELISA and tested its efficiency using determined cut-off followed by determination of cut-off using 40 sputum samples comprising of 20 TB positive samples confirmed on clinical examinations and acid fast screening and 20 non- TB samples were selected from controls.
1) and all the six intestinal tissue sections were found ZN stain positive 12/53(22.64 %), whereas five of the forty seven impressions and five of the five tissue sections of mesenteric lymph nodes 10/52(19.23% ) showed acid fast bacilli (Table-1).
Out of these 454 PCR positive samples, 69 samples were positive to acid fast staining and 31 samples could be cultured on the medium.
The organism's acid-fast nature can commonly result in a misidentification of other acid fast bacterium such as M.
Although histopathologic examination of lymphnode was nonspecific for tuberculosis, acid fast bacilli could be demonstrated in the biopsy of splenic nodule in this case (9).
This revealed miliary tuberculosis with diffuse granulomatous disease, caseation necrosis, and acid fast organisms identified at multi-organ sites including the liver, lungs, kidneys and adrenal glands.
tuberculosis and other mycobacteria "acid fast" bacteria because their fatty cell walls prevent the cells from being decolorized by acid solutions after staining during diagnostic tests.
* On a modified acid-fast-stained slide of stool (the technique used by most laboratories looking for Cyclospora), the oocysts may be unstained or stain light pink to deep red (i.e., the organism is only variably acid fast).