Ziehl-Neelsen staining is primarily used to detect which type of organisms?

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Multiple Choice

Ziehl-Neelsen staining is primarily used to detect which type of organisms?

Explanation:
Ziehl-Neelsen staining targets organisms with a waxy, mycolic-acid–rich cell wall. The dye carbol fuchsin is driven into these cells with heat, and after decolorization with acid-alcohol, acid-fast organisms retain the red color while non–acid-fast cells are decolorized and counterstained blue. This makes acid-fast bacteria, especially Mycobacterium species like M. tuberculosis, easy to identify against a contrasting background. Other options don’t fit because Gram staining is used for distinguishing Gram-positive cocci and other bacteria, fungi require different stains (such as PAS or Gomori methenamine silver), and parasites are identified with other specialized stains.

Ziehl-Neelsen staining targets organisms with a waxy, mycolic-acid–rich cell wall. The dye carbol fuchsin is driven into these cells with heat, and after decolorization with acid-alcohol, acid-fast organisms retain the red color while non–acid-fast cells are decolorized and counterstained blue. This makes acid-fast bacteria, especially Mycobacterium species like M. tuberculosis, easy to identify against a contrasting background. Other options don’t fit because Gram staining is used for distinguishing Gram-positive cocci and other bacteria, fungi require different stains (such as PAS or Gomori methenamine silver), and parasites are identified with other specialized stains.

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