Micro & Immunology · single question
What is the main function of IgA?
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Correct answer: B. Antiviral (prevents mucosal attachment — first line of defense)
- A. While IgA has some antibacterial activity, its primary highlighted function in this context is antiviral mucosal protection.
- B. Correct. IgA's main function is to prevent pathogen (especially viral) attachment/adhesion to mucosal surfaces, serving as a first line of mucosal defense.
- C. IgA is a relatively weak activator of complement compared to IgM and IgG; complement activation is not its main highlighted function.
- D. Allergic responses are mediated primarily by IgE, not IgA.
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