Which of the following is known as the acid-fast bacillus?

Which of the following is known as the acid-fast bacillus?

• A. Staphylococcus aureus
• B. Salmonella typhi
• C. Mycobacterium tuberculosis
• D. Clostridium tetani

Answer: (C)

Mycobacterium tuberculosis is known as the acid-fast bacillus due to its unique cell wall structure, which contains a high lipid content, specifically mycolic acid. This characteristic makes the organism resistant to conventional staining methods, necessitating the use of acid-fast staining techniques like the Ziehl-Neelsen stain. In this procedure, the mycobacteria retain the primary stain even when exposed to acid-alcohol, allowing for their identification under a microscope. Other bacteria listed, such as Staphylococcus aureus, Salmonella typhi, and Clostridium tetani, do not exhibit acid-fast properties and have different structural characteristics that influence their staining and identification in laboratory settings. Understanding the distinguishing features of Mycobacterium tuberculosis is crucial for diagnosing tuberculosis and implementing appropriate public health measures.

Mycobacterium tuberculosis is known as the acid-fast bacillus due to its unique cell wall structure, which contains a high lipid content, specifically mycolic acid. This characteristic makes the organism resistant to conventional staining methods, necessitating the use of acid-fast staining techniques like the Ziehl-Neelsen stain. In this procedure, the mycobacteria retain the primary stain even when exposed to acid-alcohol, allowing for their identification under a microscope.

Other bacteria listed, such as Staphylococcus aureus, Salmonella typhi, and Clostridium tetani, do not exhibit acid-fast properties and have different structural characteristics that influence their staining and identification in laboratory settings. Understanding the distinguishing features of Mycobacterium tuberculosis is crucial for diagnosing tuberculosis and implementing appropriate public health measures.