acid-fast stain


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Related to acid-fast stain: Acid fast bacilli

acid-fast stain

[′as·əd ‚fast ′stān]
(microbiology)
A differential stain used in identifying species of Mycobacterium and one species of Nocardia.
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Acid-fast stains give positive results in less than 25% of cases and do not correlate with the severity of the infection.
There were 82 cases that were purely IGA-positive and 18 cases of positive evidence of other TB-related indicators; 15 cases were positive for IGA and tuberculin skin testing; 1 case was positive for IGA and the Zeihl-Neelsen acid-fast stain test; 2 cases were positive for IGA, Tuberculin skin testing and the Zeihl-Neelsen acid-fast stain test (Table 2).
Both acidfast bacilli (AFB) and Fite's acid-fast stains (Figure 2(c)) showed bacilli in the dermis, consistent with a mycobacterial infection.
A Fite acid-fast stain was also negative for mycobacteria in the lung and liver granuloma samples, and the bacteria in the facial granuloma were not acid-fast.
A modified acid-fast stain is performed to identify parasites such as Cryptosporidium and Isospora, causing chronic diarrhoea in immunocompromised patients.
The abscess exudates were negative on Gram stain, culture, and acid-fast stain. The pathology specimen was consistent with a simple abscess and reactive inflammation in the muscle and periosteum.
The primary acid-fast stain on the elbow aspirate was negative.
Physicians should order a Fite stain on the skin biopsy specimen because Mycobacterium leprae is sensitive to the alcohol decolorizing step; if only a routine acid-fast stain (Ziehl-Neelsen) is ordered, the diagnosis is often missed (10).
Acid-fast stain of the sigmoid ulcer biopsy obtained during the first colonoscopy showed acid-fast organisms consistent with mycobacteria (Figure 5).
Necropsies were performed on both animals on February 23, and revealed Cryptosporidium oocysts on an acid-fast stain of an intestine smear from one of the calves.
The gains were chosen empirically to maximize contrast of the red acid-fast stain without saturation while limiting the peak intensity of the green background staining to approximately half of the peak intensity of the red channel.
Sputum acid-fast stain and tuberculosis culture did not yield tuberculosis bacilli.