Which term describes the immune response that develops after exposure to a pathogen and includes immunological memory?

Which term describes the immune response that develops after exposure to a pathogen and includes immunological memory?

• A. Active immunity
• B. Passive immunity
• C. Vaccination
• D. Inflammation

Answer: (A)

The main idea here is the role of memory in the immune response. After a pathogen is encountered, the adaptive immune system mounts a targeted response and forms memory cells, so the body can respond more quickly and strongly if the same pathogen appears again. That combination of a specific response plus lasting memory is what defines active immunity. In contrast, passive immunity comes from antibodies earned from another source and doesn’t create lasting memory in the recipient. Inflammation is part of the immediate, nonspecific defense and doesn’t by itself involve immunological memory. Vaccination can trigger active immunity by presenting antigens to the immune system, but the term that describes the response after exposure to a pathogen and its memory is active immunity.

The main idea here is the role of memory in the immune response. After a pathogen is encountered, the adaptive immune system mounts a targeted response and forms memory cells, so the body can respond more quickly and strongly if the same pathogen appears again. That combination of a specific response plus lasting memory is what defines active immunity. In contrast, passive immunity comes from antibodies earned from another source and doesn’t create lasting memory in the recipient. Inflammation is part of the immediate, nonspecific defense and doesn’t by itself involve immunological memory. Vaccination can trigger active immunity by presenting antigens to the immune system, but the term that describes the response after exposure to a pathogen and its memory is active immunity.