Multiple choice

The mucosal surfaces represent the largest area of exposure of the body to external pathogens like bacteria, viruses, protozoans, etc. Which among the following types of immunoglobulins initially protects the mucosal surfaces of the body?

  1. IgG

  2. IgM

  3. IgE

  4. Secretory IgA

  5. IgD

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

IgA with secretory piece is dimeric and is the main Ig which prevents adherence of bacteria to the mucosal surface and opsonizes bacteria for adherence to macrophages with Fc alpha receptors.