A patient is having thick, gray coating on the throat and tonsils, followed with fever, chills and swollen glands in the neck. Microscopic examination of nasopharyngeal or pharyngeal swab showed gram positive organism with a special stain. The constitutes of the stain are:-
**Core Concept**
The question describes a clinical presentation of tonsillitis, a common infection of the tonsils, often caused by bacteria such as Streptococcus pyogenes. The microscopic examination of a nasopharyngeal or pharyngeal swab revealed a gram-positive organism, indicating the presence of a bacterial infection. The special stain used to identify this organism is a key component of the diagnosis.
**Why the Correct Answer is Right**
The correct answer is B, Toluidine blue, malachite green, glacial acetic, because this combination of dyes is used in the Albert staining method, specifically for the identification of Corynebacterium diphtheriae, a gram-positive bacterium that can cause diphtheria. The Albert stain is a selective stain that helps differentiate Corynebacterium diphtheriae from other gram-positive bacteria. Toluidine blue acts as a primary stain, while malachite green is used as a counterstain to highlight the metachromatic granules present in Corynebacterium diphtheriae. The addition of glacial acetic acid helps to preserve the stain and enhance the visibility of the metachromatic granules.
**Why Each Wrong Option is Incorrect**
**Option A:** Crystal violet and Gram's iodine are components of the Gram staining method, which differentiates between gram-positive and gram-negative bacteria based on the composition of their cell walls. However, they are not used in the Albert staining method.
**Option C:** Carbol fuchsin, acid alcohol, and methylene blue are components of the Ziehl-Neelsen stain, which is used to identify acid-fast bacteria such as Mycobacterium tuberculosis. This stain is not used to identify Corynebacterium diphtheriae.
**Option D:** Methylene blue is a counterstain used in various staining methods, but it is not a component of the Albert staining method used to identify Corynebacterium diphtheriae.
**Clinical Pearl / High-Yield Fact**
Corynebacterium diphtheriae is a gram-positive bacterium that can cause diphtheria, a potentially life-threatening infection characterized by a thick, gray coating on the tonsils and throat, followed by fever, chills, and swollen glands in the neck. The Albert staining method is a key diagnostic tool for identifying this bacterium in clinical specimens.
**✓ Correct Answer: B. Toluidine blue, malachite green, glacial acetic**