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acid-fast

   Also found in: Dictionary/thesaurus, Wikipedia 0.03 sec.
acid-fast (as´id-fast) not readily decolorized by acids after staining.
acid-fast
adj.
Of or relating to bacteria that are not decolorized by an acidic alcohol solution after they have been stained.
acid-fastness n.
acid-fast
1. not readily decolorized by acids after staining; said of bacteria, especially Mycobacterium spp.
2. stain demonstrating this characteristic. See also Ziehl-Neelsen stain.
modified acid-fast bacteria
resist decolorization by mild acid solutions; includes Brucella and Nocardia.


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Although tuberculosis was suspected, no acid-fast bacilli were identified, and cultures were negative for mycobacteria; histologic examination showed noncaseating granulomata.
Misdiagnosing melioidosis by Handy, Rupert / Emerging Infectious Diseases
Stains for acid-fast bacilli with Grocott-Gomori methenamine-silver nitrate were negative.
Sarcoidosis presenting as a solitary parotid mass by Caushaj, Philip F. / Ear, Nose and Throat Journal
A transbronchial lung biopsy (Figure 2) showed interstitial chronic inflammation and collections of epithelioid cells suggestive of granulomas with negative stains for acid-fast bacilli and fungus and, on review, diagnostic of hypersensitivity pneumonitis.
Hypersensitivity pneumonitis associated with environmental ... by Milton, Donald / Environmental Health Perspectives
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