27d ā¢ Multiple choice answers
š§Ŗ Answer Reveal: Recall Question of the Day
Question:
The ZiehlāNeelsen stain is primarily used to detect:
ā
Correct Answer:
B) Acid-fast organisms
š§ Explanation:
The ZiehlāNeelsen stain is used to identify acid-fast organisms, especially:
š Mycobacterium species (like M. tuberculosis)
These organisms have a waxy cell wall rich in mycolic acids, which allows them to:
ā¢ Retain carbol fuchsin dye
ā¢ Resist decolorization with acid-alcohol
ā¢ Appear bright red/pink rods š“ under the microscope
š¬ What about the other options?
A) Fungal spores ā
ā¢ Typically seen with special fungal stains (e.g., lactophenol cotton blue)
C) Bacterial capsules ā
ā¢ Detected using India ink or capsule stains
D) Spirochetes ā
ā¢ Too thin for Gram stain ā seen with dark-field microscopy or special stains
š” Quick Recall Tip:
š„ Ziehl-Neelsen = Acid-Fast = Mycobacterium
š„ Think: Red rods = Acid-fast
š Did you get it right?
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š§Ŗ Answer Reveal: Recall Question of the Day
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