Micro & Immunology · single question
Which immunoglobulin is the PRIMARY antibody found in saliva?
Show answer and explanation
Correct answer: D. Secretory IgA (sIgA)
Secretory IgA (sIgA) is the predominant immunoglobulin in saliva, produced locally by plasma cells in salivary glands, protecting oral mucosa from pathogens.
- A. ❌ IgG is the main serum immunoglobulin; not primary in saliva.
- B. ❌ IgE mediates allergy; found in trace amounts.
- C. ❌ IgM is the primary acute-phase serum antibody.
- D. ✅ CORRECT – sIgA is the dominant salivary immunoglobulin.
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