Lab method
Acid-fast stain
Mycolic-acid wall staining concept
AS-id fast stayn
High-yield clue
Acid-fast positivity is the stain clue for mycolic-acid-rich organisms.
Overview
A differential staining concept used in coursework to connect mycolic-acid-rich cell walls with mycobacteria and select partially acid-fast organisms.
Classification
- Differential stain
- Cell-wall concept
Lab & identification clues
- Ziehl-Neelsen vocabulary
- Auramine-rhodamine vocabulary
- Mycolic acid concept
Associations
- Mycobacterium tuberculosis
- Nocardia partial acid-fast vocabulary
- Cryptosporidium modified acid-fast concept
Commonly confused with
- Gram stain
- Endospore stain
Your notes
Original concept summary for coursework. Sources checked: OpenStax Microbiology 2e and NCBI Bookshelf Medical Microbiology; reviewed 2026-06. Describes vocabulary and interpretation concepts only; not a lab protocol and not for handling specimens or identifying patient isolates.