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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Demonstration of Charcot-Leyden crystals by acid-fast stains applied on tissues.
With suspected TB meningitis, scanty acid-fast bacilli may be observed on microscopy, but acid-fast stains are often negative and TB culture should be performed (Table I).
With the acid-fast stain, these illnesses would be misidentified as TB and, in most instances, also would be reported as treatment failures.
An acid-fast stain revealed numerous beaded, acid-fast bacilli in the keratin layers of the inflammatory exudate, and fewer bacilli within the inflammatory process of the marginal biopsy specimen (Fig 1).
3], protein value 36 mg/dl, glucose value 83 mg/dl, negative culture, negative acid-fast stain, and negative Cryptococcus antigen.
Gram stain (Figure, C) and a modified acid-fast stain (Figure, D) revealed gram-positive, partially acid-fast filamentous organisms branching at right angles within the eosinophilic material consistent with Nocardia organisms.
I did an acid-fast stain on them when I got back and found Cyclospora cayetanensis
It is classified as a bacteria, with a distinctive branching, filamentous, gram-positive rod morphology; staining positive by acid-fast stain due to the mycolic-acid content of its cell wall.