The Ziehl-Neelsen stain is used to detect which group of bacteria?

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Multiple Choice

The Ziehl-Neelsen stain is used to detect which group of bacteria?

Ziehl-Neelsen staining targets bacteria with a waxy, mycolic-acid–rich cell wall that resists decolorization by acid alcohol. The method uses carbol fuchsin with heat to penetrate that wall; after a decolorizer, acid-fast organisms retain the red stain while non–acid-fast cells take up the blue counterstain. This makes acid-fast bacteria, especially Mycobacterium species like M. tuberculosis and M. leprae, readily identifiable. Spore-forming bacteria are typically detected with a spore stain, Gram-positive cocci are best seen with Gram staining, and curved rods are usually assessed by other stains or methods, not primarily by Ziehl-Neelsen.

Ziehl-Neelsen staining targets bacteria with a waxy, mycolic-acid–rich cell wall that resists decolorization by acid alcohol. The method uses carbol fuchsin with heat to penetrate that wall; after a decolorizer, acid-fast organisms retain the red stain while non–acid-fast cells take up the blue counterstain. This makes acid-fast bacteria, especially Mycobacterium species like M. tuberculosis and M. leprae, readily identifiable. Spore-forming bacteria are typically detected with a spore stain, Gram-positive cocci are best seen with Gram staining, and curved rods are usually assessed by other stains or methods, not primarily by Ziehl-Neelsen.

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