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. ac  id-fast ness 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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