Micro & Immunology · single question
What is the main function of IgA?
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Correct answer: A. Antibacterial
- A. CORRECT. Secretory IgA mainly provides mucosal defense by neutralizing pathogens and blocking bacterial adhesion. Among these options, antibacterial protection is the keyed answer.
- B. INCORRECT. It also neutralizes viruses, but the keyed primary role here is antibacterial mucosal defense.
- C. INCORRECT. IgA is a weak complement activator compared with IgM and IgG.
- D. INCORRECT. Allergic responses are mediated by IgE.
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