Question

Check all of the following which could describe the first interaction of the acquired immune system to an infection. A. Binding to IgM B. Activation of complement proteins C. None of the above D. Binding to IgG E. Stimulation of T-cell by APC

Answer 1

E. Stimulation of T-cell by APC

The initial exposure of the body to an infectious agent e.g. through a vaccine, triggers an immune response most of which rapidly diminishes after the vaccination.  However some cells of the immune system called lymphocytes remain with a memory of that pathogen.As a result, if the same pathogen infects a vaccinated person, the memory cells remember and recognize it and rapidly spring into action triggering a much more rapid response specific to that pathogen than the initial exposure, effectively dealing and neutralizing the pathogen.