Active immunity refers to which immune response?

Active immunity refers to which immune response?

• A. The immune response to an attack by a foreign substance
• B. The passive transfer of antibodies
• C. The autoimmune response
• D. The inflammatory response

Answer: (A)

Active immunity happens when your own immune system is stimulated by a foreign substance—such as a pathogen or a vaccine antigen—and mounts a targeted response, producing specific antibodies and activated T cells while also forming memory cells for faster protection if the same invader is encountered again. This memory is what makes active immunity long-lasting. It differs from passive immunity, where antibodies are transferred from another person or animal and no lasting immunological memory is created. The autoimmune response is when the immune system attacks the body's own tissues, not a defense against invaders. The inflammatory response is the immediate, nonspecific reaction of innate immunity and does not by itself establish antigen-specific memory.

Active immunity happens when your own immune system is stimulated by a foreign substance—such as a pathogen or a vaccine antigen—and mounts a targeted response, producing specific antibodies and activated T cells while also forming memory cells for faster protection if the same invader is encountered again. This memory is what makes active immunity long-lasting. It differs from passive immunity, where antibodies are transferred from another person or animal and no lasting immunological memory is created. The autoimmune response is when the immune system attacks the body's own tissues, not a defense against invaders. The inflammatory response is the immediate, nonspecific reaction of innate immunity and does not by itself establish antigen-specific memory.