Albert's Stain

Function

Albert's Stain is a specialized differential staining technique used in microbiology to identify Corynebacterium diphtheriae, the causative agent of Diphtheria. The stain specifically targets metachromatic granules (also known as Volutin or Babes-Ernst granules) which are storage bodies of polyphosphate found in the bacteria. These granules stain bluish-black, while the body of the bacilli stains green, creating a characteristic appearance.

Why it is Ordered

This test is ordered when a patient presents with symptoms of Diphtheria, most notably a thick, gray pseudomembrane covering the throat and tonsils, along with sore throat, fever, and swollen lymph nodes ('bull neck' appearance). Because Diphtheria is a medical emergency with high mortality due to toxin-mediated heart and nerve damage, rapid presumptive identification via Albert's stain is critical while awaiting culture results.

Associated Conditions

• Diphtheria: An acute, highly contagious bacterial disease.
• Pharyngitis/Tonsillitis: Differential diagnosis for severe throat infections.
• Myocarditis and Neuropathy: Complications of the diphtheria toxin that occur if the infection is not treated promptly with antitoxin.

Clinical Interpretation

The presence of green-colored, club-shaped bacilli arranged in 'Chinese letter' or 'L and V' patterns with bluish-black polar granules is strongly suggestive of C. diphtheriae. However, other non-pathogenic diphtheroids can also show granules, so this must be confirmed with biochemical tests and toxigenicity assays (like the Elek test).