In Ziehl-Neelsen staining, the background color observed with Streptococcus is what?

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Multiple Choice

In Ziehl-Neelsen staining, the background color observed with Streptococcus is what?

Explanation:
Ziehl-Neelsen staining uses a red primary stain for acid-fast organisms, followed by decolorization with acid-alcohol. Acid-fast organisms retain the red color, while non–acid-fast cells are decolorized and then counterstained with a blue dye. Streptococcus is not acid-fast, so it takes up the blue counterstain, producing a blue background (or blue-stained cells against the field). This contrast—red for acid-fast organisms versus blue for non–acid-fast—helps distinguish acid-fast bacteria from non–acid-fast ones.

Ziehl-Neelsen staining uses a red primary stain for acid-fast organisms, followed by decolorization with acid-alcohol. Acid-fast organisms retain the red color, while non–acid-fast cells are decolorized and then counterstained with a blue dye. Streptococcus is not acid-fast, so it takes up the blue counterstain, producing a blue background (or blue-stained cells against the field). This contrast—red for acid-fast organisms versus blue for non–acid-fast—helps distinguish acid-fast bacteria from non–acid-fast ones.

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