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Micro & Immunology · single question

Secretory IgA in saliva provides which type of protective function?

  1. Antibacterial defense
  2. Primarily mechanical lubrication with no immune function
  3. Primarily a buffering function with no antimicrobial role
  4. Exclusively antiviral defense with no antibacterial role
Show answer and explanation

Correct answer: A. Antibacterial defense

Secretory IgA provides antibacterial mucosal defense by blocking bacterial adherence to oral mucosal surfaces, helping prevent colonization by pathogenic organisms. (IgA also has antiviral neutralizing activity, but its antibacterial role is the specific function most directly tested here.)

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