The type of immunity that follows the injection of an immunogen is termed

• A. Artificial active
• B. Natural active
• C. Artificial passive
• D. Innate

Answer: (A)

When an immunogen is injected, the body's adaptive immune system is actively stimulated to respond. This creates active immunity because the host’s own lymphocytes generate specific antibodies and memory cells in response to the antigen. Because the antigen is introduced by a deliberate intervention, it is artificial. The immune response is active, not passive, since the body is producing its own immunity rather than receiving ready-made antibodies. It isn’t innate immunity, which is non-specific and present from birth, not a targeted response to a deliberate immunization. This is the rationale for labeling it artificial active immunity.