Which of the following organisms are referred to as acid-fast bacilli? (Note: They are stained with an acid-fast stain rather than the Gram stain.)

Question

Quizplus · Accepted Answer

Acid-fast bacilli are bacteria that are resistant to decolorization by acids after being stained with a dye such as Ziehl-Neelsen stain. The most well-known acid-fast bacillus is Mycobacterium tuberculosis, the causative agent of tuberculosis. Therefore, the best choice is A, as Escherichia coli, Streptococcus pneumoniae, and Neisseria gonorrhoeae are not acid-fast bacilli.

Which of the Following Organisms Are Referred to as Acid-Fast