Which fluorescent stain is used for Mycobacteria and produces a golden yellow color?

Which fluorescent stain is used for Mycobacteria and produces a golden yellow color?

• A. Hematoxylin
• B. Accustain stain
• C. Auramine-rhodamine stain
• D. Fluorescein stain

Answer: (C)

The auramine-rhodamine stain is specifically designed for identifying mycobacteria, including Mycobacterium tuberculosis, and is notable for producing a bright golden yellow color under ultraviolet light. This characteristic is key for the visualization of mycobacterial organisms in histopathological samples. The fluorescent properties of this stain allow it to bind to the mycolic acids present in the cell wall of mycobacteria, making them easily visible against a dark background. This technique enhances the detection and diagnosis of mycobacterial infections, which can be critical in clinical settings. In contrast, other stains listed do not have the same specificity for mycobacteria or do not produce the same distinctive color. Hematoxylin, for instance, is used primarily for staining cell nuclei and does not have the fluorescent properties needed for detecting mycobacteria. The Accustain stain is also not commonly used for mycobacterial identification, and fluorescein stain is more associated with other applications in fluorescence microscopy rather than targeting mycobacteria specifically. Thus, auramine-rhodamine stain is the correct and best option for this purpose.

The auramine-rhodamine stain is specifically designed for identifying mycobacteria, including Mycobacterium tuberculosis, and is notable for producing a bright golden yellow color under ultraviolet light. This characteristic is key for the visualization of mycobacterial organisms in histopathological samples. The fluorescent properties of this stain allow it to bind to the mycolic acids present in the cell wall of mycobacteria, making them easily visible against a dark background. This technique enhances the detection and diagnosis of mycobacterial infections, which can be critical in clinical settings.

In contrast, other stains listed do not have the same specificity for mycobacteria or do not produce the same distinctive color. Hematoxylin, for instance, is used primarily for staining cell nuclei and does not have the fluorescent properties needed for detecting mycobacteria. The Accustain stain is also not commonly used for mycobacterial identification, and fluorescein stain is more associated with other applications in fluorescence microscopy rather than targeting mycobacteria specifically. Thus, auramine-rhodamine stain is the correct and best option for this purpose.